Hi, what is the economical way to replace the clutch shoes on the pw50. The clutch specs says the shoe lining thickness is 1 mm with a service limit of .7 mm. I don't understand why the service limit is so high, as it seems the shoes have plenty of linings. Anyway, BikeBandit only lists the whole clutch assembly and no option to just buy the clutch shoes. What do you guys do to rebuild the clutch?