Using the Greenlee 1981 manual crimper is easy. First, adjust the screw according to the size of the connector you're using. Then place the lug terminal or splice connector and the wire in the crimper. Squeeze the handle firmly to create a proper crimp. Remember to check the W - shaped mark after crimping to ensure a good connection. When it comes to maintenance, keep the crimper clean and dry. You can use a soft cloth to wipe it down after each use. Store it in a dry place to prevent rusting. Also, if you notice any issues with the adjustment screw or the handle, don't try to fix it yourself. Contact a professional for repairs.