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Nednico

Barrel arbor fitting into the mainspring

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Hello there !

I'm facing a problem fitting the barrel arbor into the mainspring. I've just changed the mainspring for a brand new one, from generale ressorts and I have difficulty to insert the arbor, the spring end is very tight.

Any suggestion because I'm afraid to break the spring or damage the barrel or arbor.

Thank you.

Nico

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If you have a casing cushion or something similar place the barrel with the spring on the cushion before you attempt to fit the arbor in. It’s very soft in the middle and you will need this for the arbour to go in all the way. Otherwise your mat/desk will prevent you from pushing the arbor all the way down.

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When I face a stubborn arbor/spring pairing, I use a collet-holding pin-vise, with the barrel held on top of a piece of round pithwood with a hole in the center. Granted, the collet-holding vise may not be an easy get, but I suppose a large pin-vise would work just as well.

With two-piece Swiss arbors, I have used a pointed piece of pegwood to keep the arbor centered as I manipulate it into the inner coil with the back end of brass tweezers. Good luck.

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    • Thanks I've read that post before and a couple of others on this movement. Particularly this one https://mb.nawcc.org/threads/welch-verdi-pendulum-assembly.154830/ If you look at the attached pics carefully you can see the brass rod (that I'm calling the crutch) attached to the pendulum rod behind the movement. I'm sure this brass rod attaches to the part I circled previously that you are calling the crutch.  I'm new to all the terms so forgive me if I get anything wrong!  It's not impossible that the pendulum and rod aren't original to the clock but very unlikely. Clock has been in the family since  early 1900s at least possibly longer. Come to think of it though why is the suspension spring mount missing? It's entirely possible one of my ancestors has fiddled with it... It does make sense that the slot would fit to the part i circled as you suggest but it doesn't and the evidence of the pic I've attached suggests there is another part. If it wasn't for this pic and another I've seen with the brass rod attached the pendulum I'd agree the pendulum rod was the wrong one for the clock.  
    • Take a look at this post, this is a Verdi with a view of the back of the movement and the single piece crutch, which is much longer than the one on your clock, but Welch did make both long and short pendulum drop versions, I suspect on your clock either the pendulum is incorrect or someone as altered the length of the crutch. https://mb.nawcc.org/threads/welch-verdi-movement-help-please.33377/
    • I cant see why there would have to be any other part the L shape crutch only has to pass through a slot on the pendulum, are you sure that the pendulum is the correct one for the clock? it looks like someone has tried to alter the slot on the rod at some stage because its pretty chewed up at the back.
    • The slot in the pendulum rod is way too low down for that to fit. My understanding is that there should be a brass rod crutch to fit onto this part but I cannot find a pic or diagram of how.
    • That is the crutch, that part would go into the slot on the pendulum rod.
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