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Remove the roll pin securing the driven gear onto the main shaft for complete disassembly. The shim is used to limit endplay (we routinely set ours to around 0.020-inch). More is acceptable, but significantly less could prevent proper lubrication of the lower bushing, or possibly bind the centrifugal advance or oil pump as the aluminum housing expands. Also, be sure to align the machined "dot" on its side with the rotor tip when reinstalling the gear. According to vintage Delco literature, its purpose is to properly phase the distributor during installation into an engine.