I have a thruster fin that keeps coming loose, Both grub screws are an issue. They don't seem stripped as they do back up tight so I'm thinking a bigger grub screw wont help.
I tried a bit if thread tape this morning to see if that would help grab but they were loose again mid way through a session.. luckily I attached a fin key to my leash now.
I'm not sure what to try next? There are groove marks on rhe fins so I'm wondering where the screws are causing grooves which is causing play?
Interesting problem. I suspect that part of the issue may be that the two tabs in the fin box may not be snug enough when you first put them in? If so, try to tighten them up a bit with either a shim or a bit of tape on the tabs. If the tabs are sloppy in the box before you tighten the screw they will gradually loosen the screw.
FRP said.. Interesting problem. I suspect that part of the issue may be that the two tabs in the fin box may not be snug enough when you first put them in? If so, try to tighten them up a bit with either a shim or a bit of tape on the tabs. If the tabs are sloppy in the box before you tighten the screw they will gradually loosen the screw.
Bob
I was thinking of something similar to that do a couple wraps with some electrical tape to see if it tightens the fin up. I'll have a look later to see if there is any noticeable play in the fin.
Re Screws, most supplied are stubby, not allowing much thread turns to grip . Your local surf shop may have longer screws for longboard side fins or checkout your local Nut n Bolt wholesaler, to get longer length screws in your current thread pitch. Compare what's your best bet for oversized whilst you're there. ENJOY
