The Secret Society of Lathe Trolls

Hi man. It is the collars. Gotta unscrew them a bit.

Sound on grooves

Cut-a-life

I truly feel heating is the way to go. Did you solve the issue? Stylus do wear faster when cold.

I seriously doubt any patent is active as of now.

Beautiful Machine

I think the manual should have nice info. However they do tend to keep a safety margin. Have this in mind and you will be safe.

Best is to take a methodical approach. Start with big stuff and check for resistance between different ground points. Should be no big difference otherwise you have trouble.