. Rules and practice for adjusting watches . ned bysighting across the flat of the spring and focusingupon the inner coil to see that it is level for at leastone half of its length from the point of exit. After (102) Special Notes this operation has been completed and the pin hasbeen set up tight, with the surplus ends cut offflush with the collet it will be necessary to slightlypull the coil up or down, providing it is not perfectlylevel. The next operation will be that of truingthe round and all work and bending of the springfor this operation is concentrated within the firstquarter of the c
. Rules and practice for adjusting watches . ned bysighting across the flat of the spring and focusingupon the inner coil to see that it is level for at leastone half of its length from the point of exit. After (102) Special Notes this operation has been completed and the pin hasbeen set up tight, with the surplus ends cut offflush with the collet it will be necessary to slightlypull the coil up or down, providing it is not perfectlylevel. The next operation will be that of truingthe round and all work and bending of the springfor this operation is concentrated within the firstquarter of the coil from its point of attachment andit is seldom ever necessary to make any bendsbeyond the first eighth of the coil from the attachedpoint. Figure 28 may be of some value in gaining anidea as to just how this inner coil should appearwhen it has been trued. The broken lines illustrate a condition after col-leting and before truing. The heavy lines illustratetwo positions into either of which the coil may beformed in getting the spring Fig. 28 The outer black line shows the most adaptableform for most instances. The inner black lineshows the most practical form for use in instanceswhere there is unusual space between the colletand the inner coil. It will be noted that these twoforms blend into the true spiral form of the springat about one-eighth of the coil distant from thecollet. These forms may be used as a basis for (103) Special Notes truing the spring in any instance in which it hasbeen bent or mishandled around the collet afterits original truing. Experts always true springs after they have beenstaked to the balance and a light weight caliperstapered on one end to a smaller diameter than thecollet is used for spinning the balance, makingobservations, and corrections. Considerable progress can be made by some watch-makers in removing the spring from the balanceand placing it on a colleting tool or tapered broachand then truing the flat and round as good as pos-sible
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