Hi

I'm hoping someone can help me with this.

I've just bought a Formula board which has a deep tuttle box. This is a replacement box from the factory fitted one to reinforce for foiling.

I want to use the board initially for sailing with a fin, but all 3 deep tuttle fins I have won't seat. They are several mm proud of the board surface.

Measuring the box it looks like the box is around 6mm shallower at the front end than the fin head at the front end.

My question is - is it ok to grind 6mm off the fin head to make it seat correctly? Will this ruin the fin, especially in terms of shortening the bolt hole etc.

Anyone have experience of this? ??