I'm just starting work on a Westminster chime weight-driven grandmother clock. (I cannot tell you how excited I am to have acquired my first long-case clock!) There are several previously-installed bushings that are shallower than the plates: I estimate that these are 1.5mm bushings installed in 2.5 mm plates. Should I replace them? I have 3mm bushings available. As a beginner I'd be grateful for any advice!