Mortise Lock Rebuild - Almost Done - Please help

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Yinzer75

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Greetings,
I had to rebuild my mortise lock after dropping it on the floor. I couldn't find a diagram (or even figure out what brand/model it is). I am down to the last piece.

Can someone please tell me where to place the last piece. I can't seem to figure it out.

Thanks so much for any help. It's much appreciated.
 

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Unusual lock, not seen one in the UK. I think in the bottom right hand corner there is a snib mechanism to lock the latch when the door is closed in the frame. This should be sticking out the faceplate like the latch and deadbolt but its not, I think that part acts on it to push it out. Fit the case plate back on and see if the latch and deadbolt work, that will narrow it down
 
Thanks @NorthWest1 It's from my 1920s house here in Pittsburgh, PA USA. The lock doesn't have any markings to identify it. The cylinder says R Knob W which wasn't of much help.

I agree. I think it goes with the thumb press buttons at the bottom. Just can't find anything for the arm to swing off of.
 
It might go on a pivot pin that has something else on it. There are no empty looking pins so the pin probably already has something on it, which you would have to lift off for access

The deadbolt drawback mechanism seems to have something missing. I can't see a part that lifts the tumbler and draws back the bolt.
 
Is the missing piece shiny on any surface that aligns with a shiny place elsewhere, because they rub together and in service, and the hole lines up with a pin?

Can you show a picture of the plate that covers all this mechanism up, as if the lock were open like a book so we can see potentail rub marks on that plate too?

Do you need it to lock? Do you have another door that locks with the same mechanism that you don't need to lock? Do you even have to keep the same lock mechanism?
 
Village Salvage in Waynesville, Ohio. These guys refurbish antique mortise locks and I'm sure if you sent a pic they'd point you in the right direction,

I think it may go on one of those posts in the last pic and connect the lever gate to the linkage arm to retract the latch ( in this case it would just sit on the post in the orientation it is pictured) If you assemble the lock and test each function below, it will become apparent;

1. Door knob from inside pulls latch back and can throw/retract deadbolt if required
2. From outside, key cylinder ( not shown ) throws deabolt and withdraws deadbolt
3. From outside, depending on which of the buttons on the faceplate is pressed, the outside handle may or may-not be locked, in which case, you will need the key to pull back the latch and open the door.
 
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