Using these Fender locking machine heads is easy. First, make sure your guitar has a dual - pin mounting configuration. Then, attach the tuners using the included mounting hardware. When stringing your guitar, use the tuners to increase the break angle over the nut for better tuning stability. There's no need to use string trees anymore. For maintenance, keep the tuners clean and dry. You can use a soft cloth to wipe them occasionally. If you notice any loose parts, check the mounting hardware and tighten it if necessary. Remember, these tuners have a 18:1 gear ratio, so turn them gently for precise tuning.