Took the handles and put the square shaft in my vise. Years of use had twisted the shafts a little. Twisted them back and they are perfect now.
Good idea. Did you have to use heat?
I took the lazy approach and put the square shafts in my vice, heated them and bent them a little to put the handle square with the world. Didn't take much. Lubed the mechanism. Been working for 30 years with no problem. Hasn't sagged a bit since.