I use migs for sheetmetal a lot, but I haven't had good luck in this type of situation. I have to remove a lot of bolts from 1/4" - 1/2" that are broken off well below the surface of a cast iron part and the wire can touch a thread above the bolt where a stick won't arc as easily. In this case a mig will probably work ok.
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2 Originals, 100, 105, 125, 1450, 1200, 2 IH 982's, 1211, 1872, 2072, 2-1864's, 1782, a few 42" front blades, 2 Haban 54" blades, Haban sickle mower, BB36, QA-36A, 42" IH rear blade, 42" IH landscape rake, #1 tiller, #40 box blade, 59M shredder, #2 cart, International 3312 push mower, International 250 power washer, 1952 IH refridgerator, 1971 IH 1210 3/4T 4x4 truck
  
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