I got zapped today, fortunately I didn't wound/burn myself, but it did remind me these machines were made in a different era.

When working on my machines, I am very aware that they should be unplugged given the large number of exposed points you could potentially touch.  I keep it part of my mental checklist to explicitly check power is disconnected before messing around with anything below the paper feed.  On my M28 wall mount, there is fiberboard covering the connections on the LESU, but there are spots here and there that would probably be dangerous.  Fortunately, I did have my machine unplugged or my zap would likely be much worse (I assume up to and including the worst).

My motor reset switch keeps randomly tripping from time to time despite replacing the starting capacitor - Model 28 startup motor trouble – Stickelman.net

Thinking I might be able to reach this reset switch from the underside (rather than taking it apart to reach it), I poked around from underneath and must have hit a lead going to a capacitor (likely the starting cap) when I got zapped.  I should have known this would be a hazard, but I didn't really think of it until now.

So for those that are new to teletypes be aware they will bite pretty hard even when unplugged if you touch the wrong thing.