Somewhere,somehow,someone is going to get his loaned tool messed up by loaning it to a person who really doesn't know how to use it. Suppose you loan a MT reamer to someone who doesn't know that his tailstock is hardened. He tries to ream the hole. Your reamer now is screwed up. No telling what this tool loaning can lead to. After all,we really do not know each other personally. We just have a fellowship here.
Chambering reamers for guns can be "borrowed" from some dealers for a fee. But,they make you pay the full price of a new reamer before they send it to you. Then,if the reamer is returned UNDAMAGED,they refund your money. That is a wise policy. There are lots of ham handed wannabe gunsmiths out there.
For example,I know only 2 people who I would let use my Hardinge lathe. And,I know them very well,they having worked with me for many years.
This clown from the golf course of the museum used to come over and use our Grizzly lathe to SAND DOWN pieces of drill rod a few thou.. He used them to make rear axles for golf carts. He did properly cover the lathe,but would have been better off using cold rolled steel.
He used to never be able to turn the lathe off with the switch rod on the apron of the lathe. He ran the lathe full speed,and several times would throw the lathe in reverse because he was too stupid to feel the notch in the switch to STOP it. This went on for a few years.
He had a budget,but had foolishly bought a milling machine when he should have bought a lathe. His mill was not cheap,either. All his maintenance work involved making new axles.
I was just about to forbid him the use of our lathe,when he got fired. He had peeled the state inspection sticker off a museum vehicle,and put it on his own car. Too lazy to take it to get inspected. Good riddance!
There are all kinds of fools out there. I advise CAUTION. Many tools like reamers,indicators,calipers,and other tools are delicate.
I don't want to sound stingy. I am not. I am very generous. But,I have known guys who could tear up an anvil!!!