The assembly consists of two sleeve bearings inserted at both ends of a cast metal holer. First the bearing is checked visually and everything is in good shape. Swabbing with cotton buds and alcohol does not show any dirty lubricant. The assembly is then inserted into a oven. Heat is then slowly and carefully applied to the joint to ensure that expansion is as linear as possible.
Next the assembly is immersed in solvent (like common paint thinner in an open ceramic or glass bowl) and then set back into the over at a lower temperature of about 130~150 degrees Celsius.