[Texasrocker]

Im not for sure, but perhaps there used to be a rubber-bushing that may have hardened and is missing? If so, try finding some neoprene type rubber hose from a automotive store ( of proper thickness) that will fit snuggly to the shaft to make shafts rotate together. Ive had similar probs with old Atwater Kent sets, and adding the rubber-shaft bushing worked replacing the missing parts. On Philcos, Im not sure tho. The "vernier" is a slow-moving shaft for fine-tuning on the SW bands on most old radios or communications receivers. Once Ron or Chuck gets back here, they will be able to tell you exactly what is wrong. Im just tryin to help with ideas in the interim.