, and I would if I could, but I can't.
We think that such a crankshaft end bolt as this would be machined flat on the underside of the hex to seat 'flat' against the largest (and first pulley) in a recessed opening
barely large enough for the 36mm socket. The pulley is machined, both sides, to be between the bolt head
and the end of the crankshaft. There may be a machined washer in there too. So, there are no exposed threads to view.
We have since bumped the starter, and know that the crankshaft rotates, from the pulley (forward) end, counter-clockwise (CCW), and still not getting any simple movement (not applied the heat yet)