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Hi all - I am working on a Langendorf pocket watch movement which needed the lower balance hole jewel replaced. This is my first time reaming, measuring, ordering a new jewel and I need to check with you experts if I made a mistake in ordering or if ofrei made an error in selecting the jewel they sent me. I did a load of research to prepare for this repair. I reamed the hole up to a reamer measuring 1.19mm and my pivot measures 0.11mm. I ordered a convex olive hole balance jewel 12/120. I received the jewel in an envelope hand written 12/120. When I went to press in my jewel, it fell straight through the hole with ease. I measured it with the most accurate equipment I have and I am getting 1.00mm. So my novice question for you today is did I misunderstand the measurement and ordering or did the vendor send me the wrong diameter jewel at 100 instead of 120? Another way to ask this stupid question is should a 120 jewel order measure 120 or did I miss a detail? -
By Terrinecold · Posted
I measured the width at 2.05mm. The smallest wrench I have found so far is 2.5mm. Just found that the imperial set has a 5/64” which will be just a tiny bit too small but a file should be able to fix that -
By Neverenoughwatches · Posted
Yes all broaches are tapered, without the tapered length they would not broach evenly and the tapering does vary. Minimum to maximum broaching out sizes are quoted per broach. -
By Neverenoughwatches · Posted
Yep i use it on cases but i recently tried it to polish up a pin pallet fork, it does leave fine scratches visible under magnification where as polinum polished those out. -
It was already mentioned in many mainspring threads here 🙂: There is an optimum length/thickness that gives the maximum run time. The mainspring will occupy half of the inside barrel space then. Longer or shorter (same thickness of course) will need more than or less than half barrel space: less run time! Frank
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