Hi Fred, I used to bush all my Combat planes' Bell Cranks with lengths of 3/32 brass tubing as follows: Cut the brass to a length of about 3/16, use a nail set or some other tapered tool to flair out the first side of the work, of course you must drill out the Aluminum crank to receive the length of brass tubing first, then peen the flared tube over with a small ball peen hammer, turn the work over and repeat on the other side of the bellcrank. Run an appropriate drill through the hole, add a length of schrink tight tubing on to the cable, run the cable through the work and wrap appropriately, shrink the tubing to adhere the whole job. I've got several bell cranks set up like this which are still performing after over 50 years! I used ball point pens for the pushrod areas of these old planes and once every thing is completed I added heavy bearing grease to all moving surfaces! Last a very long time!
Phil Spillman