Looks like a lack of lubrication, destroyed the bushes?
Good grades en19t or en24t should last well. Chrome plated hydraulic bar can often be found cheap. I dont know if normal metal bushes any good on chrome plate, but its what they use for bike forks and most hydraulics.
@cram
No lube is correct & no way to lube other than swamping with oil can, going to BORE new shafts and put in grease nipples @gaz1
Problem with OD and with