A common problem with standard longboard center fin boxes is for some fins to not fit properly. Some fins will be a hair too wide and need a bit of force, while others are too thin and will slop around side to side. The latter is more problematic because it can affect the boards handling, and possibly add stress to the box resulting in damage to the board.
For a fin that is very snug fitting, rubbing a bit of wax on the sides of the fin base will lubricate the fin just enough to help you slide it in. Water based gels work well too, but will wash away and wont help you get the fin back out. This trick also works well with other fin systems such as Futures, FCS, and Pro-Box.
For a fin that is too loose, all you need is a strip of thick paper or thin cardboard. For thinner paper, you can fold it over a few times until you get the right size wedge. Hook the fixed tab on the fin into the box and slide it to the position you want your fin in, and hen put the paper wedge over the box. When you push the fin down into the box, the paper should wedge in on both sides and give the fin a nice snug fit. The paper should last quite a while if you don't take the fin out. In a pinch you can use candy wrappers, mexican food receipts, or a leaf of sea weed. Whatever you use, just be sure to trim it down flush with the fin box.
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