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Choosing a replacement mainspring


mbhorology
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I'm new to this forum and fairly new to watch repairing (following BHI distance learning course) so I hope this question is in the correct place.

I'm wanting to replace a broken mainspring in a pocket watch and have identified the GR6413 as the correct size spring.

This has a "normal bridle", but I'm not familiar with this term. 

Can anyone advise me of the hookings for this spring? Is "Normal Bridle" the term that GR use for a resilient hook?

Does centre of the spring have a eye cut for a snailed arbor?

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Thanks for the replies, I've added a couple of pictures.  This is the hook:

IMG_20180320_152114976_HDR.thumb.jpg.89386c9c1575537146977e00c9e457a4.jpg

And this is the barrel (yet to be cleaned)

 

IMG_20180320_152152999_HDR.thumb.jpg.4437fbf3adcb925b9c83c1378a97c162.jpg

 

The centre of the spring is a standard eye which goes onto a sailed arbor.

 

IMG_20180320_153421534_HDR.thumb.jpg.8a89d70c73ebb1e2f01884a2efced710.jpg

 

Does the GR6413 have these bookings?

Thanks

Mark

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1 hour ago, mbhorology said:

Thanks for the replies, I've added a couple of pictures.  This is the hook:

IMG_20180320_152114976_HDR.thumb.jpg.89386c9c1575537146977e00c9e457a4.jpg

And this is the barrel (yet to be cleaned)

 

IMG_20180320_152152999_HDR.thumb.jpg.4437fbf3adcb925b9c83c1378a97c162.jpg

 

The centre of the spring is a standard eye which goes onto a sailed arbor.

 

IMG_20180320_153421534_HDR.thumb.jpg.8a89d70c73ebb1e2f01884a2efced710.jpg

 

Does the GR6413 have these bookings?

Thanks

Mark

A normal non-automatic  mainspring will do fine. GR6413 will work. That has a normal bridle. Just pop it in and it will hook into the cut out when you wind it up. 

Edited by rogart63
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