Rubbing strip for leeboard. This is located on the leeward chine under water. The white strip is Acetal, very low friction and impossible to glue! see below 

Fixing on the impossible to glue Acetal. 50mm Kevlar tape was laminated to a glass table. When cured this was countersunk bolted to the Acetal witj the addition of 25mm penny washers. A pine reinforcement strip had previously been bonded to the hull. Using a Foursner bit this was counter bored  to take the nut and washer. The Acetal and Kevlar assembly will be bonded to the pine reinforcement. Very pleased with this solution to such a tricky problem but may still add some counter sunk screws. Obviously this would all be much easier if building from scratch and not modifying a existing craft.