I am not sure i understand Jeff's thesis, due to language difficulties.
Thread marks from the slip rotation of a grinding disc screw shaft ... wouldn't they be paralel, instead of wavy (curved ) ? And why interrupted and not continuous ?
Also if a disc grinder was used, why can't we see the respective grinding evidence?
Jaw marks from a vise grip, or even from a regular screw vise ... in this case, we should find similar marks, even if more faded, in the opposite side of the oject, which is not the case; actually the other side of the blade has no "mechanical" looking marks at all, as neither the rest of the axe. Also in the case of a vise clamping action, the position seems very unhandy(assymetrical and angled ); why then the reason ?
I hope i make myself understood and am not talking nonsense
Fernando