Probably a dumb question, but since this one occurred it is a little confusing.

How important is it to have a good seal at the top of the screw holes and the fin box in tuttle box (or powerbox, or anything where the attachment comes through the deck)?

Recently went for a sail with fin not really tightly screwed in (only a quickie in 12-14 knots) and board spun out several times with no excessive back foot load or speed.

I am assuming air getting in through the poorly sealed holes in top of fin box allowed air to get in and ventilate fin, leading to spin out.

Any thoughts?

Clarence