Fitting Tuttle Fin

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kuotadriver
kuotadriver
68 posts
68 posts
4 Jul 2026 9:50am
Trying to mate this Z fin with a Carbon Art. It’s a very tight fit and takes a fair bit of wiggling to get it to where it is in the pic. I can get the front of the tuttle head to sit flush with the board but not the rear. Have trawled through the subject on here and other forums. Am I correct in thinking that I just need to sand the front and rear surfaces for it to fit flush?

elmo
elmo
WA
8897 posts
WA, 8897 posts
4 Jul 2026 11:18am
Before sanding try to pull down with screws, set it so the base is level first unlike what you have in the photo.

If you just sand away, without pulling down with screws you may end up with the opposite scenario of the base sitting too low.

kuotadriver
kuotadriver
68 posts
68 posts
4 Jul 2026 11:23am
Ok thanks Elmo. How do I work out which area to sand once I’ve done that?
firiebob
firiebob
WA
3183 posts
WA, 3183 posts
4 Jul 2026 11:46am
I sand both ends a little, then as Elmo said fit it and tighten screws, if still proud repeat. If you keep sanding and hand fitting there's a chance you'll sand too much and the fin will be recessed when the screws are tightened.
Mark _australia
Mark _australia
WA
23729 posts
WA, 23729 posts
4 Jul 2026 12:06pm
Agree with last two. But always test if you can get it to sit with front flush or rear flush but never both. Then you know it’s just too long or deep but the tapers are correct

if it will only ever sit with one end flush but never the other no matter what you do it’s gonna be way harder.

so are you sure u can’t make it sit the other way?
jdfoils
jdfoils
465 posts
465 posts
4 Jul 2026 1:02pm
Rub the fin base with chalk and then install the fin. The area that make contact will transfer.chalk from the fin base to the box. Sand those areas until you achieve the level of fit you desire.
kuotadriver
kuotadriver
68 posts
68 posts
4 Jul 2026 5:11pm
Mark _australia said..
Agree with last two. But always test if you can get it to sit with front flush or rear flush but never both. Then you know it’s just too long or deep but the tapers are correct

if it will only ever sit with one end flush but never the other no matter what you do it’s gonna be way harder.

so are you sure u can’t make it sit the other way?


Both will sit flush but not at the same time. So it’s possibly too long.
Mark _australia
Mark _australia
WA
23729 posts
WA, 23729 posts
4 Jul 2026 7:06pm
Right then it’s easy. Sand front and rear tapers evenly with a block - no freehanding it.


but like others said do not test fit by hand it will need screws to pull it in
else you will be low when tightening it up
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