Ever try to clean a chimney with a toothbrush?

Oof, that voltage drift is a silent killer. I mean, it's not just about checking the dial more often, maybe it's just me but I worry about the ripple getting worse as those old supplies age. A bad filter cap could send nasty spikes even if the average voltage looks okay on a meter. I keep a sacrificial cheap USB hub on the bench to plug in for a quick load test before the real thing.

Oh man, that feeling is the WORST. My cousin had a similar thing happen with a car repair last year, total nightmare. They quoted her one price and the final bill was almost double.