Ah, I see. I was already wondering why the belt wouldn't start jumping off the pulley, as it was angled like on the picture. But if part is a mock-up, it makes more sense.
You have good contacts @ Robinson, it seems. I once asked them for a pinion with 3.2mm hole instead of 2mm, and that was about impossible to pull off, it would cost a lot of money. While it wasn't even a custom part, just drilling a different size hole.
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