I let my BIL borrow one of my 1050's, with a 24" bar, many years ago. Told him "Don't let it touch the ground". Explained how just a little dirt is like a grinding wheel. When I got it back it looked like he put all 240Lbs he had holding it on a block of concrete, and .404 chain isn't cheap. Haven't leant a chainsaw since.
My neighbor came over a couple weeks ago begging one of my chainsaws to cut down a row of forsythia about 50 or 60 yards long. I knew he'd rock it or do something else to ruin it. He ruins any and every mechanical thing he touches. So, I gave him my Milwaukee Sazall. He called a little while later and said "I think it came off the track". I'm like "came off what track, there is not track." He says "it's not broken, I can hear the motor running, but the blades not moving". Gee Pete, that's my definaition of "BROKEN".
I'm to the point the only tool I'll lend out is my tooth brush, you know, the one I use to clean parts with, Joe.