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.