Repairing A Worn Barrel Bridge

[clockboy]

I was asked to look at a Sekonda that was running for approx. 8/9 hours & then stopping but would run with again with encouragement. When I opened the watch it was extremely dirty But I noticed that under the mainspring barrel there was wear on the plate. After reassembling the barrel & bridge it was apparent that the barrel bridge hole for the barrel was very badly worn. The answer was to re-bush the hole.

 

I had some clock bushes & luckily had a bushing that had the correct size hole. The problem was however the plate was only 0.373mm thick so effectively I had to make a bushing that was not much more than a washer.

 

I turned the bush down on my lathe to a reasonable working thickness & then reamed out the hole for the new bushing (3.00mm).

 

Then I fitted the bushing using my staking set & tested the hole was correct. After a lot of broaching using a smoothing broach achieved a good fit.

 

I then removed the new bushing & using a soft piece of wood as a base filled & burnished the bush to the correct thickness.

 

Then I finally pushed the new bushing in with my staking tool but added for safety some lock tight to it,s edge as it is a very thin bushing. Job done just the watch to re-assemble.

 

[autowind]

Nice work.   :thumbsu:

[rogart63]

Very nice done :)

[Geo]

Great job CB, thanks for sharing! :)

[oldhippy]

A very nice bit of work.

 

Question, Aren't parts available any more for this cal.

[clockboy]

A very nice bit of work.

 

Question, Aren't parts available any more for this cal.

Probably but I thought learning how to do this repair useful for watches without readily available spares.

[oldhippy]

Probably but I thought learning how to do this repair useful for watches without readily available spares.

A good point.

[frenchie]

Nice work !!!!! Very impressive 

[clockboy]

Providing it runs for 30hrs without a re-wind Job Jobbed

 

 

 

PS  before service & repairs DU - 29 S/D  B.E 1.9

[Michael]

Great work Clockboy. I am sure you are pleased with the result. Good clear photos as well

[GuiBer]

Great work clockboy, and also very didactic. Thanks!

 

( Just a question: would it not be possible to push in the new  bushing with the Seitz tool? )

Edited October 5, 2015 by GuiBer