Quote:
Originally Posted by Paul O.
Glyptol?
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Well, I looked up glyptol since I never heard of it. I think that's unlikely as it is intended as an insulator and is likely too expensive. I also don't know if it existed back then.
I imagine that on assembly just after calibration they dabbed a little on to 1) fix it in place and protect it from vibration, and 2) to make it visible if anything changed. Something cheap, visible, and that will adhere to metal like fingernail polish would do.