CousinsUK.com and their return policy
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Yes, I understand that indeed. Which is exactly what I am lacking, as I said. That's why the ring diameter matters to me. That matches my anecdotal observation indeed. It could be the material or the modern backward curve that provides more power. This is an interesting topic! While these old oils were maybe thinner, their friction-reducing effect may still actually be lower than modern (even thicker oils), no? I man, some old, thin, organic oil may be less effective in reducing friction than a modern, thick HP1300 or so. What do you think?
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Here are a couple of pictures of the tool that I mentioned in my first reply: Got the picture from here: https://klocksnack.se/threads/hobby-hörna-hemma-verktyg-tips-och-trix.163821/#post-4291582
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By Neverenoughwatches · Posted
Yep seen this tool before but never for sale. I bet there aren't many that aren't broken. -
There is a tool for this, if you can find one. It's called an Obama Jewel Hole Gauge. It consists of a finely tapered pin which you push into the hole as far as it will go. The pin then pushes back into the body of the instrument until the jewel is against the tip. The hole diameter can then be read off the scale in 0.01mm increments down to 0.05mm. If you could find a suitably fine tapered pin there's no reason why you couldn't improvise by marking where the jewel sits on the taper and then measuring it with a micrometer. In practice though if you are replacing a jewel you could always just measure the pivot that is going to run in it.
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From what I’ve seen Rich below 0.1mm aren’t available unless maybe from a Swiss manufacturer I don’t know and I can easily imagine the price for 1 to be more than that whole Aliexpress set 😂🤪 my next thought is that the really small sizes would be more likely found in ladies movements which we do less often? Maybe one of the professional guys we are so lucky to have here can help educate us? Tom
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