Cut the clutch liner to length of the ID of the clutch bell. Then smear a light coat of epoxy to the ID of the clutch bell. After that wrap the clutch with electrical tape a couple of times so that the clutch is able to put slight pressure on the liner to cure.
When installing the pinion to the bearing block, coat the mating surface of the pinion with JB Weld to ensure that the bearing and pinion are secured. Assemble and let cure overnight.