Expanding square hole in suspension spring?

Isaac

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Aug 5, 2013
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Hey all,

Need some advice on what you guys think I should do to make the square hole a bit longer in this suspension spring for my PHS clock I've been restoring. Any ideas on how I can accomplish this cleanly and without bending up the suspension spring?

Attached is a picture of the new suspension spring (right), the original broken suspension spring (left), and the brass plug that connects the pendulum leader to the suspension spring.

Any advice is appreciated.

IMG_2873.jpg
 

Willie X

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Feb 9, 2008
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A rotary tool with a small cut-off wheel will do it. Work from one side and then the other. Diamond files are good too, if you can find one small enough. Willie X
 

Micam100

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Nov 11, 2019
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Hello Isaac,

If you are going to reuse the brass “rivet”, anneal if first. It would have work hardened if you opened it up to remove it from the pendulum leader and may break when you bend the little tabs back down.

I made one that that did just that, so I had to make another and I annealed it before every bend.

Michael
 

shutterbug

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Timesavers #11096, 11097 and 11098 look pretty close. That might be easier.
 

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