I owned a few surfboards in the past. On all those boards, the fins always fit snug and thight in their fin box. I always thought that the screws were there just to secure the fins "verticaly" into the box.
I've got a new surfboard with stock fins and box and there's a play of more than 1/16'' in length with the fin in the box. There is also a play in the other axe in the box, but this one is harder to measure.
In my case, the screws hold the fin in the 3 axes. Looks to me like a lot of stress and effort for those two small screws...!?!?
My problem is that i thight the screws at max before every session, but even with that 2 out of my 3 fins come loose after 15 minutes of riding. When I say loose, I mean really loose... At the point that i cannot ride the board anymore without tightening them again...
My question is: in your opinion, are those screws design to just secure the fin verticaly in the box or they're supposed to secure the fin in the 3 axes of effort?
Before anyone ask, the fins are stock. Never, sanded, grinded, etc...