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Generally speaking the technique is to place the oiled balanced cock upside down make sure the balance spring stud screw is adequately backed out and with regulating pins opened place the sprung balance upside down into the balance cock jewel. When you are proficient you will have a very high rate of success getting the balance spring stud into it's hole. The stud is then tightened using the screw. The balance is then picked up and gently turned over above the bench as to let the balance hang from the cock. After the balance is in the movement check that the balance spring is in the regulating pins and adjust the height of the balance spring by loosening the screw and using a CIMP to set the balance spring flat. Cleanliness and lubrication rules apply.
 

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Balance springs can support the weight of the balance. Be careful and deliberate with your movements and use a balance tack. On older watches the steel wasn't as hard or elastic. So being softer requires more care - any stretching can distort the spring out of flat - but - the balance spring can support he balance. A wildly bouncing spring can of course distort or tangle - be careful and deliberate and use a balance tack (yes I repeated myself). I think the "don't let it hang" is somewhat of a tale in that it provides a safe approach to the unskilled. I am speaking of relatively modern watches here not boars hair or glass etc......

The CIMP is my un-patented but copy righted "Carl Issacson Memorial Pick" Do a search and you will find the info - it is a DIY pick for delicate manipulations.
 
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