formariz 11,874 #1 Posted May 13, 2014 Having quite a few K91s unused sitting on the shelves i just noticed recently upon retrofitting one on a newly aquired RJ that the shaft was 5/8" instead of the typical 3/4" sending me on a wild goose chase for the proper pulley. Has anyone come across one? And will it be a problem strength wise if it's on a working tractor? Share this post Link to post Share on other sites