Depends on why they want to borrow my machine and the level of their experience. Also is the machine important or not. A stranger lent her machine to me so I could sew some things for a church , I was visiting my sister in law and they needed some sewing done. The machine in question had been stored in a closet and not used in yrs, I was able to adjust the stitch length and completed the project. I consider that an unusual situation.