I have a ZD21 where the center blade is not tight enough and it freewheels on the axle but the bolt is super tight. Washer must be worn down and need replacement. Problem is that I can't get any leverage to hold the axle still so the tool I use on the bolt is irrelevant. I can get it out if I can get that axle fixed down somehow. Tried jamming some things in the belt to hold it still but it's no use. Anyone have an idea that will work? Thanks!