If you look at the photo of the inside of the hammers you will see that the grove larger at the top ,as the hammer falls the striker will be pushed forward by the connecting bar , when it reaches a certain point the hammer will come directly in contact with the back of the striker the connector being in the relieved space so it is in effect no longer connected .
On re-cocking as the hammer is pulled back the connecting stud which appears to be missing in the pictures will once again engage and pull the striker back .
This was abandoned on later guns with re-bounding locks as it was not needed . It was idea that had IMO built in obsolescence due to its complexity and potential weaknesses as shown in every example I have seen [ not that's many ] by the fact that the connectors are broken or have been removed .
