I found sholder bronze bushings with the correct ID diameter. I turned down the sholder until it just fit in the track, I don't have a lathe so I used my drill press and a file. Then I used a socket head shoulder bolt. I ground the head on the bolt down until it would fit into the track. I added a nylon washer just incase the track rubs on the arms. I lockited a nut on the threads of the shoulder bolt. I have not installed it but it works fine on the bench.
