[Barrie Yates]

I keep returning to a valve of some type, 3/16" D operating lever to move the valve head from position to position - steam valve? - perhaps to pressurise and then release the pressure to a cylinder.
Hey Retlaw, it is many moons since i had anything to do with mechamical devices, except the ones that discharged things from a rifled tube. Stumped so far on this one, but might have a better idea if i could make out all the lettering:-)