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Balance roller loose

Joseph111
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Joseph111 Member

Joseph111

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Hello

I have just finished replacing the balance staff of an old AM192 movement. However, I have realised that the hole in the roller is slightly to large for the staff. I ordered the staff from Cousins and it fits perfectly into the watch but it seems to be slightly to small for the roller. I am wondering if I damaged the roller when removing it.

Is there anything I can do to rectify this or will I have to spend the next month trying to make a new balance staff on the lathe that does fit?

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jdrichard Distinguished Member

jdrichard

Posted
Posted
Hello
I have just finished replacing the balance staff of an old AM192 movement. However, I have realised that the hole in the roller is slightly to large for the staff. I ordered the staff from Cousins and it fits perfectly into the watch but it seems to be slightly to small for the roller. I am wondering if I damaged the roller when removing it.
Is there anything I can do to rectify this or will I have to spend the next month trying to make a new balance staff on the lathe that does fit?

I have had this situation when I cut too much material off my balance staff on the lathe. You can close the hole by light tapping on a round stake in your staking set. Choose a stake with diameter slightly larger than the hole but not too large. Pick a flat area of your staking set table area so your not over a hole. Tap a few times but not too hard or you could split the roller table. Kind of like this video I made where I am closing a Hairspring collet, but this time you are tapping on the hole area with a round tipped stake that will spread the metal and thereby close the hole diameter. You may need to remove the jewel if it interferes with the stake.





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