Crow, I see from your other post you and I are the same age. I have been playing in one group or the other or several since I started in 55. Belong to a fine concert band here in Kalamazoo. I admit ignorance to anything lapping, lapping compound or tool! Since I joined the forums last year I have found I knew little or nothing about much of anything trumpet. I'll bring that up to Lou and see what he says about that idea for my situation, and also about the screw.
