This post is slightly out of order as I did the main and pump slideways first. These were simple milling jobs, I made a small video of machining the slots in the air-pump one…

But, now we made a second trial assembly of the principal engine castings, to get a feel for how we were progressing – the engine is really growing now, and I can just lift it, but could not go far – I would guess it at about 80-100lbs.. and there is no crank, auxiliaries or valve gear yet!