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Just sold my 11pro with a mtntk fix kit and it ran well, now with the 13pro I just bought I am wondering if a fix kit is needed. Lots of talk about thicker skirts and different case, what is the real deal? As far as I know the loose pistons haven't changed, am I wrong? Can someone clarify. MH? Dead horse beating in progress, ya I know too much conflicting info out there.