How to measure a pivot in this clock

[bunkhenry]

Hello: I purchased this clock at a flea market. One side glass was broken. The person told me that the clock did not run. When I looked into the movement I found that it has a armature instead of a spring. It runs on a 9 volt battery. I found that the pivot is broken between the armature and the cover with the jewel in the middle. I think it broke when the clock was dropped or bumped. It is a very small pivot. My question is how do I go about measuring the distance from the armature to the jewel on the plate to get the length of the pivot. The name on the clock is as follows: Concord Watch Co. Swiss cxc 98 Fifteen jewels unadjusted Swiss made. Pictures I am a retired machinist. I did not find the piece of the broken pivot.

 

[Tinker Dwight]

If you don't have any small wire gages, you can try a tapered pin.
Mark it with some machinist blue or sharpy Stick it into the jewel
carefully and rotate it. You should see a ring at the diameter.
If it bottoms out first, cut some of the pin and try again.
Be careful not to put too much pressure or you'll break the jewel.
Tinker Dwight

 

[eskmill]

The issue of the severely worn battery motor armature pivot is very common on your Concord and other branded precision battery timepiece. These were very nice presentation timepieces that kept a very good rate. Many were marketed in New York City by Relide.

The one-time-lubrication of the jewel and pivot first causes noisy operation during the periodic winding operation. With continued use, the armature pivot wears to the point of complete failure of both the pivot and the jewel.

The battery motor serves only to maintain a small mainspring in the actual balance wheel movement located below the battery motor. A clever design spoiled with a poorly balanced three-pole DC motor.

Doubtful that any maintenance parts exist for the Concord and similar battery clock. It may be possible to salvage one from a used clock. Often they're found with the only fault is a corroded battery connector. Once made operational, the motor pivot will eventually fail unless cleaned and lubricated periodically.

I was given one as an award about fifty years ago. I recall it worked well for about ten years with a yearly battery change. When finally it began to make a rattling sound every seven minutes, I removed the battery and packed the clock away.

 

[GregS]

I've never seen one of these before so this is a total shot in dark suggestion.
If the armature is symmetrical maybe you could try flipping it over and checking for clearances using the remaining pivot.
If that works it might tell you enough to make an educated guess at replacing the broken pivot.
Hope this helps,
Greg