The hammer spring is fitted.

UK watchmaker showing service of Omega Speedmaster - hammer spring fitted

This the hammer part and the flat surfaces at the upper and on the left will strike the chronograph runner hearts to reset the counters.  These are buffed.

UK watchmaker showing service of Omega Speedmaster - hammers review

And the hammer fitted.

UK watchmaker showing service of Omega Speedmaster - hammer fitted

Finally, the hour recorder yoke that will transmit the actuation to the dial side of the movement is fitted.  It extends through the plate and will be seen on the dial side later.  This side is complete.

UK watchmaker showing service of Omega Speedmaster - hour recorder yoke fitted

The movement is turned over to fit the dial side components which control the hour recorder.