I saw the way he did was different from the method shown in RWI (taking out only Bezel). Instead he took the whole movement out and pushed the crystal from behind. It happens that he took out the whole movement a lot faster than working on each screw to release the bezel.
OP, for me its conform that some gear has slip out on the sec @ 12 mecanism.
He shouldnt do the short cut on taking the movement out, if the watchsmith is not familiar with sec@12a7750.
its the transfer gear who slipped out.
i do have several pictures for reference for you, but i highly suggest you did not do a DIY on the sec@12a7750,
you might broke it and it will be worst.
so better send it to a modder that familiar with it.
you can try GOIN in taiwan, he's near you, but expect a 3 month turn over.