Atmos screws

rodlloyd

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Mar 16, 2010
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I had a bit of bad luck recently. Last month while dismantling a 528, two of the four screws holding the mainspring barrel cover snapped off when unscrewing them, leaving part of the screw in the barrel cover. I ended up using a barrel cover and screws from a scrap movement to complete my service.

Yesterday, while installing the movement on the frame on another 528, both screws sheared off. Again I used the frame from my scrap movement, but I have no replacement screws to install the movement.

1. Where can I get replacement screws.

2. How can I salvage the barrel cover and frame with partial screws stuck in them.

3. How can I prevent this in the future?
 

KurtinSA

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Nov 24, 2014
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Is the barrel cover made of brass? It's been documented that using an alum mixture will dissolve the screw and leave the brass in tact.

Kurt
 

new_hampster

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Aug 3, 2006
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Odd. I've been tinkering, including complete overhauls, with these clocks for 20 years, and I've never had a screw break. And you had 2 pairs break?
 

MartinM

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Jun 24, 2011
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If you have access to the other side of the hole the screw is broken off in, you might try drilling it from the back with a Dremel and hoping the screw breaks free and removes itself so you don't have to do any thread work on the hole. I'd suggest a LH drill bit but, they are hard to find in these sizes.
 

Jonas

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Sep 17, 2020
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I found replacement screws on eBay. Spendy, but a necessary evil. Still, no luck removing the broken screws in the screw holes.

Rod
I actually, just yesterday, broke a movement mounting screw on an Atmos, with the threaded portion remaining in the plate. My first observation was that the screw on my Atmos wasn’t brass, it was actually a plated iron or steel. I was able to remove the threaded portion from the plate by using a pointed punch and a jewelers hammer to very delicately tap on one side of the top of the screw threads and VERY slowly backing it out.
 

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