Earlier quoted context omitted.
What is the difference between "too unsafe to use" and "failed on me"?
Well, the one I am thinking of is an old-school all-metal belt sander that my grandfather gave to me. The thing is an heirloom and may very well last forever, but basically has an unacceptable lack of modern safety features at this point. No trips, no guards, horrible ergonomics, weighs a ton, and has no grounding (keep in mind it's all metal). It also takes non-standard belts and I may or may not have cut my hand op…
Ha, good example. I thought you meant unsafe from wearing out.