3 things put me off lending tools ,
1,working at a house, plumber asked to borrow electric drill, i said yes, 10 mins latter, he gave it back he had been using it to drill a large core out of a brick wall for a tumble dryer vent, his comment i think your drills crap and is smoking was enough never to lend a drill again,
2,stopped to help a roadie who asked to borrow a pump, he undid the valve fully and the end ofthe pump shot out to which he gave it a good shove back and bent the pump in half, saying i think its broke.
3, stoped to help a fellow so called cyclist, on a cycle path fix a puncture, as i was fixing his puncture looked round and he was riding off on MY bike, chased him and grabbed bike, he fell off, he wasnt happy so rode back and threw his wheel over the large hedge, which made him more unhappy.
There are some fools who dont care about others tools and dont buy their own.