Kiennger & Obergfell - Kundo Mini Anniversary Clock

In for repair is a miniature Kundo 400 day / Anniversary Clock with a Kiennger & Obergfell movement.  Upon delivery to the shop the customer stated movement has not run in a very long time.

Observations:
1)  The movement was dry and dusty.
2)  The mainspring was fully wound.

Removing the plastic suspension spring protector on the back side of the movement uncovered a problem with the suspension spring.  The spring was spun way too much causing the spring to curl.  See below.  The arrow depicts the spring.

Here is a picture of the spring removed from the movement

As "they" say, WOW

The suspension spring needed replacement.  The Horolovar 400 Day Clock Repair Guide provided information on the specifications for the mainspring thickness (.058mm).  According the the repair guide, the movement was manufactured in 1974 and made in West Germany.  I do hedge on this 

The movement was disassembled.  As mentioned before the plates and wheels were dry and dusty.  The mainspring  was removed from the barrel and examined.  Note the images below.  The lubricant was very sticky and green. The mainspring itself was very sticky and in a closed set condition.  The mainspring was stretched and steel wool was used to remove the very sticky grease and oil.  Here is a picture of the mainspring and cap before removal from the barrel.  Notice the green grease on the barrel and the thick sludge on the spring.

This image shows the movement apart.  The mainspring has been steal wooled, the barrel is still dirty, the suspension spring has been repaired.  Notice the new suspension spring with the top, bottom blocks, and the fork attached.  The original suspension spring is shown above the repaired spring without those pieces.

These pieces were ultrasonically cleaned with hi-grade clock cleaning solution.  The image below shows the movement cleaned and ready for assembly. In this image, the mainspring has been installed in the barrel.

 

This is a cool picture showing the clock wheels placed in the bottom plate ready for the top plate 

And after the movement assembled

These two images show the polished and cleaned base and case

Follow this link to see the clock running on the test stand.  It is running but the pendulum motion is not acceptable.  The clock is running with the face and hands off.  The pendulum should be turning at least 3/4 turn. As you can see, it is only running about 2 balls or 1/2 turn.  Raising the fork did not help.  The clock would stop.  The mainspring needs to be replaced.   

Everything has been adjusted correctly.  When the mainspring was removed from the clock it did look like the spring was "set" i.e. set in a position where it would not expand as designed.  A replacement mainspring is required.  There was not enough time to order the spring given the window needed for repair.  It was decided to stretch the spring and see if this would be enough.