Using the Ernie Ball Pegwinder Select is super easy. First, if you're changing strings on an acoustic guitar, use the integrated bridge pin puller to remove the bridge pins. Then, fit the non - abrasive socket head over the tuning key and start winding to loosen or tighten the strings. For bass guitars, use the Pegwinder Select Bass in the same way. When using, make sure to apply steady pressure to avoid sudden jerks that could damage the tuning keys. As for maintenance, keep it clean. You can wipe it with a dry cloth after each use. Store it in your gig bag or a dry place to prevent it from getting rusty or damaged. It's a simple tool, but with proper use and care, it'll serve you well for a long time.