Barrel Arbour Screws

[Legarm]

I've had two consecutive watches, that on servicing, the barrel arbour screw has sheared off in the arbour, this is the first time this has happened. One of the movements had no identifying calibre, except the letter "M", the dial on the watch denotes it as a REGENCY. The second is an, AS 1123, I managed to purchase another arbour from cousins, but the first one is stuck fast. 

Any ideas......

Edited September 18, 2014 by Legarm

[bobm12]

Is there any steel other than the screw bit involved in the part you want to salvage?

[Legarm]

No, just the sheared of thread stuck fast in the arbour.....

[Legarm]

Just got the replacement arbour for the AS 1123, it's a left hand thread........ didn't expect that on the arbour..... :(

[bobm12]

I was going to suggest to put the arbor with the stuck screw in clorine (clorox?). It will disolve the screw...and anything of steel.

[Legarm]

I was going to suggest to put the arbor with the stuck screw in clorine (clorox?). It will disolve the screw...and anything of steel.

 

Surely the arbour is steel.............

[Geo]

It is!

[Legarm]

It is!

 

Don't put it in chlorine then .... :)

[Geo]

I thought of using a watchmakers screw extractor. First you would have to soften the arbour by heating it, the drill through the pinion on the other side leaving enough wall thickness for the pinion still to function. You would now be able to use the extractor that grips the screw at both ends. A bit of a long shot, but it is a possibility.

If successful, you would then have to harden and temper the arbour before fitting to the watch.

http://m.youtube.com/watch?v=hQ7HWCCRATY

I saw this on another forum, it gives you three possibilities.