I got # 4593 --# 4508 for my wife years ago she used them until the clip cord had wore both clip cord holes out in both machines Until only had one clip cord that she could use on them. can't remember if they had two clip cord holes in each one or if I drilled the second one in them. have no idea how many clip cord were wore out before the holes wore out. and armature bars also finely the front coil cores were beat down so far they were no longer running as they should. eve...n after cutting off the shrink wrap. but all this time never broke a spring. burned off a lot of spring ends and contact points and probably a contact screw or two. we always use silver. and O-rings on the front coil core, plus transpore tape on the armature bar bottoms. still had them wore out clip cord holes. so was going to go to RCA plugs. but would still have four nasty looking holes looking at me .so drilled and taped them for harden steel low heads. center drilled for the clip cord. and there back going. they will eat up a few clip cords. but what the hell can't have every thing, can we.? not bad for a Micky Sharpz machine is it? I've still got the best to tell you, talking machines as so often happened at conventions a artist told me no one ever wore out a machine. finely he was so sure of himself he started talking a bet. hell I was up for that. but didn't have the machines. so just sounded like I was full of shit. pissed me off. and so I done the same for him. and we both went our ways. sometime later he and a couple of his friends showed up at the shop. said he came to pick up the $$$$$$ I had lost on the bet I popped out the machines and at that time the parts were still laying around handy so put them with machine. he paid off. I won't say who he was, but a quite well known tattoo artist.... and the bet would have bought a few of your machines.... but didn't because. didn't need them she already had a set and still dose... all I got to say is there not only $$$$$$ makers but great . Renegade See More Read Less