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Hey, guys ... banging bumping and thumping may fix the problem of centerboard sitckitis temporarily but there's nothing like cleaning out the trunk itself. There are five lag screws holding the board in place. Removing them will drop the whole thing out, pendant and all. Put the screws back with 3M 202 marine sealant ... not too tight. A round tapered rasp about 18-20" long is great for cleaning out the trunk from the bottom. It's amazing how much marine growth and other muck accumulates there.
I have found that 3/16 dacron line works better than stainless cable as long as you replace it every year. Wire rope tends to fatigue as it passes over the sheave ... braided dacron line doesn't .... and it's cheaper and a lot easier to make the right length.
Juan Mo' Time