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Old 4th December 2019
Gear Head

Never mind. It seems the screws go in from the PCB side, and the "imprint" is from the bolts that the screws go into.

There were 3 missing screws I replaced with approximate matches, and the unit seems better for it. The main volume knob was real noisy, and that seems mostly gone. It might just be from working grime out, but the pops were a little extreme for that.