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Revue/MSR T43 unusual balance cap jewels, are they correct ?

mikepilk

By mikepilk
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mikepilk Distinguished Member

mikepilk

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Stripping an  MSR T43 movement, I noticed too much end float in the balance, and then found these cap jewels.

I've never seen any like it. The jewel is flat, which may account for the excessive end float, the pivots appear OK.

On the Incabloc site they don't reference T43, but for T44 T46 the cap stones are 122.11 

which are the same as ETA 2824, 2892. 

Anyone seen any of these, are they correct ?

 

WIN_20180901_16_17_26_Pro.jpg

WIN_20180901_16_21_18_Pro.jpg

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WatchMaker Super WRT Addict

WatchMaker

Posted
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Intriguing!

This chap had the same observation... https://www.thewatchforum.co.uk/index.php?/topic/108514-incabloc-query/  ... so it seems this is a feature!

And yet if I go to a close up of another T43 movement and zoom in on the balance I can't see any reflection anomaly to indicate a cutout.

Maybe something MSR introduced in the movement's history?

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mikepilk Distinguished Member

mikepilk

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1 hour ago, nickelsilver said:
1 hour ago, mikepilk said:
I've changed them for the normal shaped ones (122.11) but still have too much end float.
Maybe  I can push the lower Incabloc in a touch.

They wouldn't change the endshake. All are flat (with the exception of some that had offset concave sections, very rare).

The cut-out ones are flat both sides - unlike the 'usual' ones with one convex surface. 

The watch over-banked when I got it, and the guard pin has a bend in it, so someone's been playing with it. 

I need to see how the pallet fork and guard pin sit, then decide what to do. The pivots look OK, so I'm not sure where the problem is.

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Nucejoe Distinguished Member

Nucejoe

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I have seen cut cabs used in other makes too. I am pretty sure on bulova 11blacd.

I too thought that is likely to give easy access for oiling. Then thought anyone who can oil pivot through this cut would do it easier with the usual method. Plus oiling the cab itself  involves more than just pouring oil on it.

We all seen cases of cabs stuck in place and sometimes are real pain to remove, the cut lets you pry the cab open/seperated  with an oiler or needle. That too can be regarded as an advantage.

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