Get standard quite square, and adjust sideways till connecting rod is in line with axis of cylinder.
Mark off and screw down the standard.
Make the eccentric, eccentric rod, and strap. Slip eccentric on shaft.
Put valve in position and draw it forward till the port is exposed.
Turn the eccentric forward, and mark the rod opposite centre of valve pin.
Bore hole for pin, and insert pin.
Hold the crank shaft firmly, and revolve eccentric till the port just begins to open on its forward stroke. Rotate crank disc on shaft till the crank pin is full forward.
Solder eccentric and disc to shaft.
Solder steam pipe to cylinder, and a brass disc to the rear end of the cylinder.
Fit a fly wheel of metal or wood. This must be fairly heavy, as it has to overcome all friction during the return or exhaust stroke.