i made these 8 openers over the last 2 weeks and i was reasonable pleased, what i found the most frustrating is when i was punshing the holes and drifting them the rag would curl up on itself and embed itself in the material ( i probably should hot rasp it before i enlarge the hole) and after drifting the hole when i wanted to enlarge the holes over the horn of the anvil i noticed the the material would try twist over itself which is a pain in the a"". probably do to lack of proper technique, butt where learning. it was fun and frustrating