Two different bases
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Rust Remover
“Machinist Workshop Magazine” did a test on penetrating oils.
the torque required to loosen them.
Nothing: 516 lbs
WD-40: 238 lbs;
PB Blaster: 214 lbs;
Liquid Wrench: 127 lbs,
Kano Kroil: 106 lbs
(ATF)/Acetone mix (50/50): 50 lbs.
Oh, well if the base is cracked from the setscrew to the opening where the die inserts, then it's probably a death sentence. A talented welder/machinist could probably do some fancy TIG welding with nickel rod, since that is some old and probably higher quality cast Iron, it may take to welding better than most. Then drill and tap for a new setscrew. Now since I said all that, the same could be possible for the other press with the broken angle/depth stop area.
The problem would be the cost, unless you have a talented friend, where you could call in a favor??? ...because a established machine shop that is capable of such work, would charge more than what a couple functional Lyman 45's are worth.
PS, I should have added, the crack/break near the Die opening can change the alignment...So that would have to be fixed, even if it ends up being used as a "lubeless" sizer.
I doubt folks many folks are seeing this. S&S or Helping Hands?