List: Removing Chickering type pin block.....screwed into plate from bottom of pinblock....two screws will not move and one broken off even with the plate. What is best method of removing each...the broken one and the two with heads still on them but rusted in the plate. Will heat on the plate damage the plate? Have removed approx. 15 bolts...only three left. Tommy Black Stuck in Decatur, Ala.
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