Is there any trick to undoing the studs and bolts in an (iron) dommie crank.
These are undisturbed after 60+ years, and seem to have been rather vigorously
centre-punched on the edge of the threads, and they are not going to give up easily.
Can the centre-punch marks be ground or filed or drilled out somehow, or is it just a matter
of using enough muscle to overcome them. Or can they just be wound up until they snap.
(are they hi-tensile ?) Assuming you already have a replacement set on hand.