Using the Klein Tools 628-20 replacement tap is easy. First, pick the right tap size (10-24, 12-24, or 1/4-20) based on your needs. You can use it on materials like metal or wood to add machine screws. To create new threads, gently turn the tap into the material. If the threads are burred, use the tap to re - form them. For plaster obstructions, carefully clean them out with the tap. When using the tap, make sure to apply even pressure to avoid damaging it or the material. After use, clean the tap with a soft brush to remove any debris. Store it in a dry place to prevent rusting. This will help keep your Klein Tools 628-20 in good working condition for a long time.