Surfing Waves

witched a fin into a new board and it won’t slide at back where the pin drops into the finbox; the rest of the base can sit fine in the finbox, but it just won’t slide back from the pin insertion point. Sanded it down a bit already, and didn’t see any glass drips in the box (though perhaps there's some where I can't see, like on the inside rim of the track where the plate slides). It seems site-specific, though I can't tell if it's an issue with the fin by the pin or something with the box.

Fwiw, fin fit fine into a different box; other fins I have on hand were slightly too fat for the box so I can't isolate that variable. Any thoughts on how to fix this? I guess I could just keep sanding the base of the fin by the pin but I'm wary in case that's not the issue, since it already works in other boards. Note: available tools are minimal (no power tools or chisels on hand). Thanks in advance!

If the fin fits fine in other boxes, then don't sand down the fin. If the box is too tight side to side, get a flat head screw driver and drag it through the box front to back / back to front and gently scrape the sides. Check the fin fitting after a few passes.