Hopefully someone can help me out here. The Toro Turfmaster old engine had a 25mm shaft the new engine I ordered came with a 7/8 shaft. I can get a sleeve that might work but the problem is there is a built in key on the pulley instead of a keyway . Any Ideas ? the sleeve I can get is a 7/8 to 1 in but still should be ok if I can get past the key issue.