The collar is tapped for two screws, which prevent S slipping on
the piston rod. The rods for R1 R2 are now provided with forks, made by
cutting and filing notches in bits of brass tubing. The notches should be
half as deep again as the rocking lever is wide, to give plenty of room for
movement. Solder the forks to the rods, and put the rods in place in the
guides, with the forks as far away from G1 as the travel of the slide
valve. Then measure to get the length of the rocking lever support. One end
of this should be filed or turned down to fit the hole drilled for it; the
other should be slotted to fit the lever accurately.
The rocking lever, RL, which should be of steel, is slotted at each end to
slide on the pins in the forks, and bored for the pivot pin, which, like
those in the forks, should be of hardened steel wire. Assemble the rocking
lever in its support and the rod forks, and solder on the support.
To the back end of R2 solder a steel plate, A, which must be bored for the
pin in the valve fork, after the correct position has been ascertained by
careful measurement.
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