You're having to make new wishbones every 20 shots? Something is most definitely wrong there mishu. Mine can and do last a whole season and I generally only change them out of course. OK they can get damaged by a careless load but that is one of the advantages of sharkfin shafts. Check out the area of the sharkfin and make sure it's well polished otherwise it will abrade the dyneema's nylon casing. Alternatively try getting a Rob Allen shaft and turning the flopper over.
How are your bands rigged, do they have small loops to tie in new wishbones without having to strip the whole thing down?
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