Don't know if they are the best but Expo supply things like that
amongst other useful parts, can often be found in Model shops or you
can buy online.
I finally found what i think is a compatible set on amazon.
A 10T 5mm bore pulley, a 50T 10mm bore pulley and a 11mm wide belt.
Less than the price of the 10T pulley on most of the sites.
I would have liked a smaller bore on the big pulley but they don't seem
to do them in metal.
It should be OTT for the job.
The real question is do I need to gear it up or gear it down?
The stepper has 4k steps per rev so it could be quite slow but the final
speed is quite low too.
I might even try it without the gears first.
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