Re: Does a 10hp tillerarm fit a 18 hp??
One thing I can think of that may be different would be the engaging cogs, or gears where the handle pivots. They used two styles. It may be easier, and cheaper to find the correct handle from a salvage dealer, or E-Bay. You could probabley buy the whole handle assembly for what the gear, and shaft would cost alone if you tried to change things around.