Most of the time I just get a new one, but I have some running through walls and under floors that I need to cut and put new ends on. The tool that attaches new ends to the wire is fairly expensive and I'm not sure how hard it is to use. Dropping $40 or more on a tool that I would rarely use is bad, but if I can not get it to work, I would be 2 X mad. Link to an easy to use tool would be appreciated. NewEgg has one for $38, but no reviews.