Yes it can; perhaps impulse jewel can't enter the fork horn, if the shock has knocked a pallet jewel out of alighnment or bent a pivot.
Remove the two black screws then the automatic device, loosen the cock screw by couple turns, raise the bridge just enough to pass the impulse jewel over the fork so to get impulse jewel inside the horn, tighten cock screw.
It will run, however , might get stuck again if pallet jewels have got misaligned or a pivot has got bent.
I decided to find a knew winding pinion for my Vulcain. I see some wear on the one I have. I have the spec sheet on the Vulcain 120 and identified the part as #1246. I searched around and found scotchwatch.com had one. $45. I really want it, so I bought it. Meanwhile, I continued my search and found a part with a different part number (410) on Northern Watch & Clock Supplies in the UK. It was just a couple of pounds, so I bought it.
Later I looked at the invoice from scotchwatch.com and see that the part I bought is 1246 (410), so I think the part has two numbers. Well, we will see when they arrive. On part cost 20x the other one.
I am not complaining...as I am glad that someone takes the effort to maintain an inventory for budding watchmakers like myself. I just think it is interesting.
Learning new things every day.
The hairspring is partially blocked from view by the autowinder but looks to be ok. The balance swings with a puff in one direction but not the other. Could it be the position for the impulse jewel and fork?