Forums > Stand Up Paddle General

Fin keeps coming loose.. any tips?

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Created by Nugdam > 9 months ago, 21 Apr 2019
Nugdam
QLD, 600 posts
21 Apr 2019 3:08PM
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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?

Any suggestions?

Rango
WA, 667 posts
21 Apr 2019 1:28PM
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Medium threadlock the blue stuff.

FRP
491 posts
21 Apr 2019 9:05PM
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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

Nugdam
QLD, 600 posts
22 Apr 2019 9:18AM
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Select to expand quote
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.

colas
4986 posts
22 Apr 2019 12:26PM
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Select to expand quote
Nugdam said..
I was thinking of something similar to that do a couple wraps with some electrical tape


Same, but I would use some incompressible material: bits of radiographic film, water bottle...
If it works, superglue them to the tab.

Tardy
4919 posts
22 Apr 2019 12:34PM
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never had much luck with lock nut ,so i use to dip them in glue on my naish boards ,they still all wind out ok .

cbigsup
454 posts
26 Apr 2019 7:06AM
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Had that problem with a futures box. Sliced beer can strips in the box and a grub screw a little longer than stock.

Voila! Just like downtown!

Bighugg
482 posts
26 Apr 2019 9:23PM
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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



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"Fin keeps coming loose.. any tips?" started by Nugdam