WS 19: Servicing a SEIKO Chronograph 6138

Here is a close-up of the top of the vertical clutch as you will see it when you open and disassemble the movement. One more time: these pictures of a disassembled clutch are only for illustration. Do not disassemble the vertical clutch!
I have marked on the axle or pinion of the chronowheel - vertical clutch assembly the two levels in which the clutch wheel is spinning. You can clearly see the slight wear as indicated by the thin black lines. The top line indicates the closed position (the clutch is lowered, the chronograph is engaged and running) and the lower black line shows the spinning position of the opened clutch. The position when the levers lifted the clutch wheel off its clutch plate mounted on the chronograph wheel. The clutch wheel then spins freely and thus the chronograph wheel does not turn, the chronograph is off or stopped.

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