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View Full Version : Quad fcs fin problem


jc4
15th September 2009, 04:29 PM
Hi, I've just bought a new 71 quad convertible and found that one of the fcs fin screws does not engage against the fin. That is, does not tighten and continues spinning.
It looks like the hole in the side of the fin base does not have thread, so was either stripped or drilled to large.
When the board was unpacked from shipping that screw had fallen out during transport, verified by shop where it was bought.
I'd like to know how this can be repaired and if anyone else has come across this situation.
Many thanks
Jaime

Ola_H
16th September 2009, 02:10 AM
I have not seen this, but I only packed up and mounted four of them. This could surely be a warranty issue. But it has to be handled by the shop. I suppose it can also be fixed with a Permatex solution (look under product/product assistance/Repair Guide) so that you can start using the board right away. But I think you then need to first fins a longer screw that will act as a guide for moulding the nes threads. A don't know what kind of thread the fin bolt screw has, but a good hardware shop should be able to help you. Unfortunately, Tiesda, who know these things, is on the road.

jc4
16th September 2009, 03:43 PM
Thanks for the reply Ola,
I am still waiting for a response from the shop where I bought it, and will try one of your suggestions, it's lucky we have no wind at the moment.
I hadn't seen the repair guide section and am hoping the products they mention will bond with the fin box material and not the screw.
As for a long term solution I'm hoping the shop will address this problem.

Jaime

Ola_H
16th September 2009, 05:11 PM
There is a special release agent supplied in the Permatex package. I think there is also a special instruction on how to go about with "through" type holed in the Permatex manual. But again, be careful to choose the right type screw for the job. And speak to the shop before doing anything to ensure this will not void a future warranty.

jc4
17th September 2009, 05:21 AM
Hi Ola,
Again thanks, I'll let you know what the shop comes back with.
Would anyone at Starboard know what type and size of thread the screw is, metric or imp. It would make it easier to chase one up and upsize the hole.
I can see this problem being a future issue. If the metal screw is overtightened it will strip the thread in the plastic fin box.
This has got to have been a problem in surfing as these types of fins have been around for quite a while.
I have tried searching on surfing and repair websites etc but haven't been able to find anything as yet.

Jaime

carvesalot
17th September 2009, 09:36 AM
http://www.permatex.com/products/Automotive/thread_compounds/thread_repair.htm

the Permatx product is this: Thread repair item # 765-1248 its use was discussed for footstrap holes that were stripped. I used this with, and don't think it worked so well, I used a different hole.
I would have something done under warranty.
The small screws will require additional care.

carvesalot
17th September 2009, 11:43 AM
http://www.star-board.com/forum/showthread.php?t=3708&highlight=footstrap+hole+repair

jc4
17th September 2009, 05:38 PM
G'day carve,
Thanks for the link.
I tried Floyd's suggestion before seeing the post of inserting a sliver of rawl plug into the hole then carefully tightening the screw, it seems to tighten and engage with the fin. Not sure how it will handle the stress of sailing though, only a temporary fix for now.
As Ola suggested I won't be doing anything too elaborate until some feedback from where I purchased the board.
I'm thinking a slightly larger guage screw may be the only remedy, unless permatex or loctite bonds well with the plastic fin box.
The length of the threaded hole is approx 7mm, and the screw is about the same, so there isn't much material to bond to.

Still waiting for shop reply.

Jaime

Ola_H
17th September 2009, 06:37 PM
I'm not a big fan of the Permatex idea for footstraps screw, but here, since we're in fact talking about a "real thread" I would say it has a good chance of working. The main issue, as indicated by jc4 and carvesalot, will be how well it bonds to the fin box material. But after all, the fin box as a whole is glued in the board with epoxy and there is also a good irregular surface inside the hole (ie the old thread) that will increase the chances of a good bond.

I don't think a larger guage screw is a good idea. There is not enough material around the whole to support a bigger screw, I reckon.

carvesalot
20th September 2009, 10:24 AM
err any update on progress ?

jc4
20th September 2009, 09:51 PM
Hi all,

No word yet. Shop is on the case with the distributor, who is on the case with manufacturer.

Will keep you posted.

Hoping to get the board wet though!!

Jaime

nonopr
20th September 2009, 09:54 PM
http://www.permatex.com/products/Automotive/thread_compounds/thread_repair.htm

the Permatx product is this: Thread repair item # 765-1248 its use was discussed for footstrap holes that were stripped. I used this with, and don't think it worked so well, I used a different hole.
I would have something done under warranty.
The small screws will require additional care.

This product is crap, it does not work. Dont use it.

eghoffman
4th May 2010, 06:27 AM
Has anyone come up with a good soultion to this? I'd hate to return a whole board just because it came with a stripped insert. I tried an FCS screw (rather than the Surfinz screw that it came with), but it didn't seem to help. It seems like upsizing should work, but I can't seem to find the specs for the screw on Google.

Funny, though - I found a marketing piece from a Surfinz distributor cutting in FCS for having easily stripped boxes. People in glass houses shouldn't throw stones...

eghoffman
16th June 2010, 07:34 AM
After looking at all the above alternatives, I finally just went the simple route - I upsized to M5-.8 X 10mm stainless set screws. It took a while to find them, but I finally got some from a place called Offshore Spars in Chesterfield, MI. So far, so good. It seems like it threaded properly, it's holding well and I the M5 is just marginally bigger than the stock screws.

OzzyJon
24th November 2010, 04:30 AM
I've just purchased a brand new 81lt Quad and 3 of the 4 fcs screws do not tighten, they just freely turn as soon as they get any resistance from the fin. It's really taken the shine off buying a new board.

I'm going to have to try buying bigger grub screws as suggested above.

Ola_H
24th November 2010, 03:41 PM
If it's a brand new board it will surely be covered under warranty. Take it back to your dealer and let him have a look.

Chesapeake
3rd January 2011, 11:09 PM
Has anyone come up with a good soultion to this? I'd hate to return a whole board just because it came with a stripped insert. I tried an FCS screw (rather than the Surfinz screw that it came with), but it didn't seem to help. It seems like upsizing should work, but I can't seem to find the specs for the screw on Google.

Funny, though - I found a marketing piece from a Surfinz distributor cutting in FCS for having easily stripped boxes. People in glass houses shouldn't throw stones...

Eghoffman,

I had a problem with the FCS screws even before hitting the water for the first time. The problem is twofold. First, the screws supplied with the board have small heads to them, preventing them from going in too deep. The second problem is the box dimensions are slightly larger than the FCS fins. I ended up stripping the screw trying to get the head of the screw to engage the fin.

Rather than returning the board, my short term solution was to drill out the original thread holes and fill them with Marinetex. This epoxy compound can be machined and allowed me to re-drill and tap the hole with new threads. I used the same size thread for the hole, but replaced the factory set screws with longer true set screws (ones that do not limit the travel). The result has been excellent and has held for the past year. The longer set screws have more bite against the FCS fin box and I have been able to bear down and get the fins absolutely locked.

I've had issues with the FCS fins themselves too. Their plastic/glass construction is no match for the lateral forces at work with windsurfing. The original FCS fins began showing signs of fatigue after about 3 months of use. I've been using G10 replacement fins, which can take the beating; however, the questionable availability of G10 FCS fins long-term has made me cautious. That and my curiousity to run the Quad with bigger fins in back has motivated me to replace the FCS fin boxes with MT boxes, which while not adjustable, are beefy enough to hold a sizable fin. You can view pictures of my winter project on the Boards forum here:

http://boards.mpora.com/forums/k4nverting-quad-2010-t56742p3.html

I'd be interested in your opinion.
Mike