Re: AR88 Tuning lock
Originally, there would have been a screw (6-32 NC?) in that threaded hole with a large thumbscrew head whose end bears on a small sprung plate that acts as a friction lock pressing on the tuning flywheel. Quite why it should be missing is difficult to explain- it has quite a long shank, so it doesn't fall off by accident, but who can explain what happens to things over the years!
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