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I worked out a simple formula to work out how much to turn a collet. great video by Mark explaining well and showing how to set the impulse jewel between the banking pins and in the middle of the horn/notch of the pallet. If the watch is running at 300 amplitude and it is a 18,000 beats per hour, then in every second the balance would turn 5 revolutions, or 5 tics, which would equate to 1500 degrees of travel. So, 1500 degrees of travel of the balance happens in 1 second, or 1000 milliseconds, so every millisecond equals 1.5 degrees of travel. If the movement is out by 3 milliseconds the collet needs to be turned 4.5 degrees (3 milliseconds x 1.5 degrees = 4.5 degrees) If the watch runs at 270 degrees, the maths would be changed accordingly and a smaller travel in degrees over the space of one second would occur
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For support, you could first try with a flat piece of pithwood. It could possibly be soft enough to push the hour wheel tube down a few tenths of a millimetre and sturdy enough not to be deformed. Then finish it off with hand levers. I've never tried it so it's just an idea.
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Do you think there's space to fit anything under that hand? I'm surprised it was even running and not scraping the dial to bits.
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