This is a spare engine I picked up for free from a buddy to use on my zero turn when and if my current Briggs intek goes out. Noticed this weekend when pulling it from the doner machine that the output shaft looks deformed on the key way slot and the key looks deformed and maybe broken off the factory pulley?. I'm not sure but aren't these keys molded into the pulleys which would mean this one broke off? Can I still use this engine on my machine if needed or is it a parts engine now? My zero turn has electric pto if that matters.