There was a time when I did loan tools. Then i loaned my chainsaw (just sharpened the chain) to one of my builders. i always used his jobs as preview of how to estimate my jobs for the upcoming busy season. if i lost his work, i might have been bidding a little high. more study and sharper pencil might be a good idea. If i did get his work, I knew I had to get back to the drawing board and determine where my pricing had been too low. Before i realized all of above, i had loaned the saw. The following spring, I needed the saw for a clearing project and called him about it. He did not bring it back the next day as promised, so I went to his house to pick it up. he had to look around, eventually finding it under a pile of form lumber. the bar had been bent, the teeth on the chain were worn to nubbins and the throttle trigger was broken. He told me he had not used it as he had not been able to start it. needless to say, he never borrowed anything from me again.
Larer, I loaned a bandsaw to a good friend. i had gotten the saw from my father and had, at the time, no place to set it up. My friend took the saw home. He found a few things wrong and started fixing. Years later, after he passed on to happier wood working, his son delivered the saw back to me. My friend had not only fixed the saw up to like new (it was nearly 50 yrs old at the time) condition. he had built a beautiful stand for the saw out od oak. He had made up a fine brass plack with my name on it.
i do, occasionally still loan out some tools, but am careful which tools and to whom.
Tinker