This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
A pivot hole is drawn in a Geneva or other kind of watch by pressing a pivot broach against one side of the pivot hole only and revolving it; this is continued until the original round pivot hole is drawn oval. Then broach it out round and bush it with a watch "bouchon," and open it out to fit the pivot once more.
 
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