I used a open end that I ground down on the sides. You can see the nuts if you get a light down there-maybe take off carb and anything you can that is in the way. Put oil on them for a day or so. Use both hands to do the job. At first(if tight) just move them both ways a little and then more oil. Move back and forth with more oil. I can get mine off in about 5 minutes now-the first time several hours of trying to figure out how?, and who invented these?Jim