A simple center bearing for selfmade sanding cylinders that are placed on a M8 threaded rod and recured in place with M8 nuts. This model is specifically for the Praktiker TB13/5E. There are two models one has a bit more tolerance than the other. Also the curves within the bearing are slightly different. You might need to try which one fits the best, I also just popped one middle part in the other outer part on one sanding cylinder. Requires some lubricant oil