Thanks guys. Well, I find a ton of them on eBay - of course they are all from China and seller is away until 02/20. Oh well, I guess our friends in Asia need time off too :)

I am just looking for 1:1 I think. I just want to drive both screws from one motor. Given that I was going to pick 3 20 tooth pulleys and 2 idlers. Any reason to use more or less teeth?

Thanks,
Wallace