2007 April 29.
The balance and its components:

Revision

First the components are to disassemble and all remaining shellac marks to remove. Afterwards follows a cleaning. The alignment of the balance to its center and a proper running true is to adjust.
An original impulse jewel is to set and with a brass pin to wedge. A staff which is tapered turned gets its conical pivots. The safety roller is pushed on.
At last follows the poising of the balance without the hairspring.