Years ago I bought a pressure canner and used it exclusively until a friend found out I had it. She wanted to borrow it and I said ok. We "shared" it for two or three years (canning in the summer). When it came time to replace the rubber ring, etc. I asked her to share the cost and she said no, it was mine so it was my job to do any repairs, etc and pay for them. So I did, and told her to buy her own canner. After that experience, I don't loan anything unless it is to my children and I know they will help cover the cost of breakage. My mother used to say " If you can't afford to replace it, don't borrow it."