I scored a free 1991 5hp model 130212 off a chipper today. The question is, are clutches available for the 1 inch cranks? Do they need a spacer up against the block since the crank is 1 inch all the way thru? Theres no tapered area for the clutch to stop. Finally, will a 3/4 crank drop in? This is a plain bearing engine so if memory serves a standard 130202 crank should fit with the stock side cover, yes? Thanks for any help....unable to find answers with search.