The big steel gear itself isn’t keyed to the shaft but the brass cone inside it is. This is a cone clutch system and the steel gear is a seperate piece and is held in place by the taper, something like a flywheel. The spring applies the needed pressure so they wont slip, until you ht a gator. The gear might be stuck on the cone and will need some persuading to break it free and I like to lube the tapers before reassembling them.
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