Haven't done any vacuum motors yet.

I dunno ... it's hit or miss with the smaller motors that come out of fans and pumps. They aren't too much trouble if you've developed efficient breakdown methods. Sometimes they're a PITA. I guess the trick is to eventually learn which ones are worth doing and which ones aren't. In general ... they seem to yield between 1/3 and 3/4 of a pound of copper.

It's something to do if are into copper. It eventually adds up.