"As 'suther51' notes above [post #5], loaning out is risky.
I have a cornucopia of odd commercial tools. Only my friends know about them. Aware of what monetary value is placed on them to replace [not my acquisition cost] borrowing stipulates that agreement. Not rent, just security.
Persons who mistreat or damage others property, do so unaware of how much work had to be done to pay for said item."

Have several of those kind of you borrow them and don't take care of them you replace them equal or greater value tools myself.