I had the all black rollers and was able to switch the bow roller to a poly, but no such luck on the wobble rollers. Shaft size is 3/4. The problem is most of the poly wobble rollers I find the ones where ribbed on the contact surface are not deep enough. What I mean by this is the current rubber ones are a smooth contact surface and the inside or hole is deep enough for the shaft to stick through. I have ordered two sets of the poly and they are never deep enough for the shaft to stick through. Just wondering if anybody has found something.

I might just resort to a sock over the rubber, although that looks cheap to me.