[joedoh]

well the shaft can be slightly worn and the wear on the bracket can need a larger sized hole so there isnt a how-to really, I am always sanding with high grit.

the brass is just high copper brass I get from the local scrap yard and turn in a drill press to get smooth.

on a couple I have needed to make a new bushing that the handle shaft rides on, you have to drill out the rivet and put the new piece in. pull on your handle, if you can move it in and out of teh regulator more than a tiny amount, that bushing will need replaced too.