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Piano wire stretched from the open front of the cylinder through the rear cover and out towards the centre of the driving wheelset
Straight datum bar set through the centre of the driving axle horns meeting up with the piano wire. The readings of horn gap width are shown chalked on the frames.
The datum bar centred between the horn faces.
The anchor for the piano wire centred at the front end of each cylinder bore
A general view of the outside of the frame and horns undergoing alignment