Seth Thomas 120 Movement - Leftover

MuensterMann

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Mar 23, 2008
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Hello! I am just getting around to reassembling a ST 120 movement. I had a leftover part. And now I notice the hands are slipping to the point of not moving. Okay, that is a hint! I photographed the center arbor with the tension spring so that I know how it goes back together. See photo below. There is a collar on the far left that should go on and hold that spider spring tight. However, I had an extra part (not shown) that looks like that collar in the photo. Does anyone know where that extra collar goes OR if it is also part of the center arbor assembly?? Thanks!

center.jpg
 

R. Croswell

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Apr 4, 2006
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Hello! I am just getting around to reassembling a ST 120 movement. I had a leftover part. And now I notice the hands are slipping to the point of not moving. Okay, that is a hint! I photographed the center arbor with the tension spring so that I know how it goes back together. See photo below. There is a collar on the far left that should go on and hold that spider spring tight. However, I had an extra part (not shown) that looks like that collar in the photo. Does anyone know where that extra collar goes OR if it is also part of the center arbor assembly?? Thanks!

View attachment 715384
This picture shows all the parts of the ST-120 center assembly. Look closely and you should see that the collar at the far left is cracked. A not so uncommon problem. If this collar is cracked it will not hold the sprig washer under enough tension to prevent the hands from slipping. I don't see your "extra part" but perhaps it is something someone added to compensate for a similarly cracked collar.

RC

DSC00514.JPG collar.jpg
 

Vernon

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Dec 9, 2006
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If you took the chime hammer assembly apart, your extra part may be from there or perhaps it's a spacer for a pillar post?
Vernon
 

wow

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Jun 24, 2008
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This picture shows all the parts of the ST-120 center assembly. Look closely and you should see that the collar at the far left is cracked. A not so uncommon problem. If this collar is cracked it will not hold the sprig washer under enough tension to prevent the hands from slipping. I don't see your "extra part" but perhaps it is something someone added to compensate for a similarly cracked collar.

RC
Like RC, I think someone just added an uncracked collar and didn’t remove the cracked one. Easier that way.

View attachment 715391 View attachment 715392
 
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