RE: Fin Screws
I've had a need to use 6mm stainless steel machine screws, and I've had fairly good luck with "Big Winds" and "The Gorge Shop" in Hood River, Oregon. I think that they know that many fins these days require 6mm screws, so they appear to be focused a bit more on the longer sizes we need, at least in my situations. Probably more expensive than some possible internet sources of supply you might be able to locate, but there could be a reasonable time savings. If you need web addresses, or other contact info, please let me know.