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These are some of the parts I make for vintage racers
If you need any of these contact me at  frank@stonemachine.com
I am hoping to get some Ducati single fork tubes done soon.
This is a rear axle for Ducati singles. It is the type with the center spacer machined in one piece. The ones with the separate spacer will sometimes break because the bearings wear a groove as they can't be as tight a fit on the axle. They are made from 4140 heat treated steel.
   

This is the center block for TD1C and DS6 crankshafts. I made one for my TD1C when I was rebuilding it. It doesn't have the cast iron center like the original.
 
This is Yamaha part 256-24628-00-00 which is the gas cap hook. It is used on TD & TZ models and also on the early XS1. It is no longer available so I made some from 6061-T6 aluminum which is much stronger than the original cast part.