correct, 20mm or less would be fine.

heres another photos to explain a bit more



you have the long steel rod with 3 holes which slides into the ally disk which holds the tools, then the cog goes on top of the ally disk. the dia of that steel rod is not changeable and will be used on the new setup. that steel rod fits perfectly into the rest of the arms and bearings etc...

Quote Originally Posted by Boyan Silyavski View Post
So basically you are saying you have place for <20mm wide pulleys with say both diameters no bigger than 20mm

so at least the belt width is clear, it could be 15mm or 10mm.

Now the big disc seems to have 20mm shaft. question is could the shaft itself be machined as a pulley or it has to be 20mm diameter and pulley over it?