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Atmos 519 pendulum lock not right

ALR guy

NAWCC Member
Jun 8, 2021
35
10
8
79
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Hi folks,
When I received this clock for repair the pendulum was loose and turning the locking arm did not change anything. Working with the pendulum and no suspension spring I can see that the locking mechanism does not lift the pendulum far enough to engage the locking ring against the bottom surface of the locking plate.

I suppose I could lower the ring on the locking post to raise the post as needed but I'm suspicious that a part is missing:
  1. There's a pointed set screw used to lock the upper ring.
  2. There's a nice deep dimple in the locking post suggesting that's where the pointed set screw should engage
  3. There is a through hole in the locking post with internal threads at the bottom of the hole
I've attached some photos showing these matters and hope somebody can enlighten me.

picture 2.jpg Locking mechanism.jpg Picture 1.jpg
 

new_hampster

Registered User
Aug 3, 2006
150
26
28
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Region
There should be 2 pins and a small spring in the end of the post. Parts 3544 and 3545 in the repair notes. If the balance was not locked, those 3 pieces could have fallen out. Or maybe they were missing to begin with and that's why the balance was not locked. They go in order pin - spring - pin.
 

ALR guy

NAWCC Member
Jun 8, 2021
35
10
8
79
Country
Aha, thanks new_hampster. I would love to have specs for the pins and spring so I can make them myself and not have to buy. It looks like I'm also missing 2 other parts 3543 and 3565. Explains the empty internal threads I spotted at the bottom of the locking post. I was thinking that was for the caliber 528 only (can't find Caliber 519 repair notes).
Missing parts.jpg
 

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