The
balance to most cylinder watches is of red brass, and in some instances
of low karat gold; in either case the balance should be repolished. To
do this dip in a strong solution of cyanide of potassium dissolved in
water; one-fourth ounce of cyanide in half pint of water is about the
proper strength. Dip and rinse, then polish with a chamois buff and
rouge.
[Illustration: Fig. 181]
In staking on the balance, care should be observed to set the banking
pin in the rim so it will come right; this is usually secured by setting
said pin so it stands opposite to the opening in the half shell. The
seat of the balance on the collet _D_ should be undercut so that there
is only an edge to rivet down on the balance. This will be better
understood by inspecting Fig. 181, where we show a vertical section of
the collet _D_ and cylinder _A_. At _g g_ is shown the undercut edge of
the balance seat, which is folded over as the balance is rivetted fast.
About all that remains now to be done is to true up the balance and
bring it to poise.
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