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Counterbalance weights __ | __ | | | | | Threads for | |<-+->| | Threads for Flywheel nut | | | | blade adapter nut | | | | | __ | V _________---| | | |-|__|_______ V ...---/ | | | | | |__| ----+... ||| | | | | | | |__| | |||| '''---\_________| | | | | |__|_______----+''' ^ ---| |_____| |-|__| ^ | |--| |--| ^ | Main bearing | | | | | Main bearing (Flywheel end) | |_____| | | (PTO/blade end) |__| ^ |__| | | +--- Crank gear (meshes with cam gear) Crank pin Journal