After 15 minutes of running, the balance/cock is removed and the pallet jewels greased.  This is achieved by adding a drop of special grease to the pallet jewel, cycling a few teeth on the escape wheel and repeating until all escape wheel teeth are greased.  The drop shown below is about the maximum that I’d start with.

UK watchmaker showing service of Omega Speedmaster - greasing of escapement

The movement is allowed to run for a day or two and then any final adjustments are made to derive the best consistency in different watch positions.  These are they six typical watch positions.

A non-chronometer watch, such as this, is tested in three positions only: CH, 9H and 6H.  The original Omega specification requires a maximum rate variation at full wind of 15 seconds per day.  Here are the three results and the variation is from +6.3 to +18.8 so this is within specification at 12.5 seconds per day.

UK watchmaker showing service of Omega Speedmaster - initial timing result in CH

UK watchmaker showing service of Omega Speedmaster - initial timing result in 9H

UK watchmaker showing service of Omega Speedmaster - initial timing result in 6H

At this point, having met the minimum specification, there is no need to work further but to achieve consistent running on the wrist, it is always worth reviewing the remaining positions to see if a small adjustment will also bring those close to this specification.  It can be an issue as one change can lead to an improvement of one position at the expense of another so, a line needs to be drawn at some point.

Both CB and 3H are mandatory checks for a chronometer and the remaining, 12H, is never specified being an unnatural position on the wrist.  I always check all six as this gives the best consistency in use.  CH and CB should be very similar in both amplitude (the swing of the balance) and rate, which they are and including these extra positions slightly increases the range above is 20.0 seconds/day over 6 positions.

UK watchmaker showing service of Omega Speedmaster - initial timing result in CB

UK watchmaker showing service of Omega Speedmaster - initial timing result in 3H

UK watchmaker showing service of Omega Speedmaster - initial timing result in 12H

This is a good result for this watch and no further adjustments are made so, the assembly continues with the chronograph parts.