Using these Fender staggered tuning machines is easy. First, make sure your guitar is a vintage - style Stratocaster or Telecaster as they won't fit American Standard, Deluxe, Pro, Elite, or Ultra models. Remove the old tuning machines from your guitar. Then, use the included mounting hardware, like the Phillips and flat - head mounting screws and bushings, to install the new ones. When installing, ensure they are firmly attached for better tuning stability. As for maintenance, keep them clean. You can use a soft cloth to wipe away dust. Avoid using harsh chemicals as they might damage the finish. Check the screws regularly to make sure they are tight, as loose screws can affect tuning. If you notice any issues with tuning or the machines seem to be having problems, it might be a good idea to have a professional guitar technician take a look.