I recently purchased a metal pulley for my older model Planar 3 but noticed (before attempting to remove the plastic one!) that the metal one was decidedly larger in diameter. The pulley is from Analogue Seduction and listed as a Rega part, designed for the P3, but I am guessing that there is a difference in the pulleys of today and the ones of yore? Correct me if I'm wrong here. Any advice on how to proceed (or not)?