Like some belts, it has become so hard to get idler tires with the right measurements we are looking for.
I checked studio electronics and IT-17 is the one I needed but is not available.
I am looking for a idler tire with inner diameter 15 mm, outer diameter 20 mm and thickness 3 mm.
Any help with finding this is greatly appreciated. I don't want to go with the "O" ring method because the surface needs to be flat for better grip (more surface area) and a fixed RPM motor pulley is in contact with it.