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Ask Bryan Jones (BryanJ)Sent from my iPhone using Tapatalk
You can get them re lined. Graham, Trigger, used to re line them for customers and our own bikes but doesn't do it now unfortunately. I'm not personally aware of anyone else that does it now but there must be someone in UK. There was a chap in Huddersfield, Terry I think, be he has retired.
"Just thinking as I am a toolmaker with access to a lathe what donor drum please did trigger use and what was the interference fit etc he used?"Thinking small car drums as scource material, maybe if you've a friendly motor factor to let you see stock items. Or something like trailer stuff, indespension or caravan drums are in that range.For disc conversion, the original Yamaha RD400 (with twin piston calipers, not floating single) had a pretty neat caliper hanger with brake top and torque arm located in similar area to the Honda drum one, that could give options or design que.Twin piston for rear is easier for alignment as once designed you don't effectively have to cope with pad wear further on.