I rate Reality Motor Works. They have done loads of work for me. I would confirm with GT that it was them and maybe give them a call.

Steve Turner at TPCS is probably better for special materials
though.

There's not much to see on my YB100. So far just the frame, bottom yoke and centre stand is together. A second NOS fork nut arrived today, I will be trying to assemble the fork puzzle soon. Headlight covers, middle covers, external springs in the middle covers, various bushes and spacers
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Why do things simply when you can complicate them