How do I teach my son to use a thread setter kit when I'm mot sure how to use it myself. Could you please teach me how this setter operates.explain if you would how this machine works on leather,also so that when I repeat this to my son he will understand me. Thank You Arlynne wieland Please see instructions listed under the tool or call our office at 888-472-1081 where one of our staff will send you a PDF document or a new set of written instruction. Thank You Sales Team at Global Stores Group