here in the lab that i work in, i have a small knife that is always clipped to the pocket of my lab coat, most people who have had want of a knife in the past know that thats its permant location. and that they can borrow it if they like, they normally ask first though which is nice, appart from that i don't lend my stuff out, i ususally go with them sort out the broblem and then go back to what i was doing. that way if anything gets broken, its my fault and i'm not going to have problems with the peoplei work with. allthough it would be nice if they went and asked someone else for a change!!
steve