First off, the dial string was broken an inch to the left of the dial indicator so it gets a new string. But to get there I have to get the tuning knob off (for other cleaning and such), while I wait for dial string to arrive. I have the two set screws out of the tuning knob and it damn near won't turn even with some oil in the grub screw holes. Prying with spoons will bend the faceplate. Dental Floss, not going to happen. Anything I can do to hasten the removal short of flame? Maybe soldering heat will work if i can get the iron in that space. Maybe I need some liquid wrench in the grub screw holes. This unit is from a smoking home so it needs to be pulled apart and cleaned and the string replaced then the switches need a deoxit treatment before I evaluate it. Relay clicked in 3 seconds and both channels had sound. Without a complete recap what will keep this unit running another dozen years? Maybe just that relay timing capacitor I've read about? Any other must do work other than a complete recap? Thanks. Please check back, I'll have more issues with this fine machine. Here is the victim: You can see it does need some cleaning.