Hi! Somewhere I have seen an .avi (or .mov?, .mp4?) movie about dismantling and re-assembling the R390A gearbox. Now that I need it, I can't find it, of course. Can anybody help? While we are on the subject, how free-running should the kc/s tuning be? Mine needs a definite firm grip to get it rotated. Paul Galpin ZS2PG