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Message: <blockquote data-quote="Tazza" data-source="post: 27631" data-attributes="member: 82">You don't want to go too hard, i don't know the properties if 1045, I'm sure your machine shop knows what they are doing though. 4140 is pretty good stuff, even when not nitrided. When its treated, it gives it a super hard casing, about .012" thick and tapers off from there.I haven't put up any pictures yet, i removed the old pivot bosses a few months back, i just haven't gotten around to installing the new ones yet. One of the machines its going in (2 to be done...) is actually dead, and out of reach of the welder. I need to mount the pins, bosses and bobtach in the arms to get them to line up so i can weld them in straight. Its one of those jobs.... It needs to be done, but so much to do before hand.All i have to show now is 4 new bosses, 6 new pins (2 spare) 8 bushings, 4 to be hardened and 4 to use as a guide to line the boss up in the bobtach. This way the heat will not damage its temper of the final ones that will be used. I just need to work out how to make a jig to line bore the tilt ram pivot point out. I have 2 to do, and i think it would come in handy, no doubt I'll do more over time.</blockquote>