Question:
There is backlash in one of my ballscrews but the screw itself looks to be in good condition. I was considering to try to replace the balls myself to keep the cost down. Would you recommend it?

Answer:
Working on a ball screw is not rocket science and anyone with reasonable mechanical abilities should be able to perform the task. It's a little like working on your own car, there are some jobs you know you have the ability to perform and others you leave to the professional. The problem with do-it-yourself ballscrew repair is if you make a mistake it can damage the unit beyond repair, and that can be expensive. In the final analysis it's a judgment call you have to make for yourself.