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Dubois Depraz chrono module - help!

Bonefixer
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Bonefixer WRT Addict

Bonefixer

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Servicing another Navitimer for a work colleague (again, I suggested he get it done professionally), this one relatively new. It has an ETA base movement with a DD chrono module bolted on. I've serviced the base movement and it's all running well. The chrono module is another story!

 I've done a DD module before, but this one is a little different. I'm struggling to get the stop-start function to work. I can see what it's meant to do, but it's not doing it. Any clues?

Image 1 shows it in the stopped position, highlighting the area of interest  image 2 is a close up showing how the arms should move when the pusher is activated. Image 3 shows what happens - the cam moves, but the lower arm doesn't pick up the post on the pusher lever. I've highlighted what should have happened and image 4 shows it in the correct running position with the post engaged with the lower arm ready to stop. Image 5 shows what happens after pushing again - the post should be picked up by the upper arm but it isn't.

 Some parts aren't in place, but I don't think I've removed any that assist in the stop start. And excuse the greasy mess - if I ever figure out what's wrong I'll put it through the wash again before final reassembly.

 Could the return springs be the issue? The clothes-peg shaped one between the two arms is in the right place as far as I know, but seems weak. And the operating level return spring is there too but again seems weak.

 Thanks in advance for any suggestions  

 

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