I've now turned my attention to making the cylinder for the 10v while I wait for my M12 taps and die to arrive. I want to make it from a cast iron block to look similar to a proper Stuart cylinder, I won't be able to make an exact copy and I do intend to add cladding so something reasonably attractive is my goal.
A piece of 40mm square cast iron looks to be just big enough
Incidentally it turns out the Stuart casting I bought as a full set has an undersize cylinder - the cast block is marked at the required diameter according to Stuart as is the trunk guide top but it is clear the cylinder casting is significantly undersize.
The wiggler and dial indicator are simple way to get the centre positioned accurately
With one end turned to match the trunk guide it is on to turning the 16mm bore. (it may look the wrong size but it just the way I'm holding it )
With the part now turned around it's just a case of centering with the coax indicator and turning a matching end flange
That completes the lathe work for the cylinder and takes me to this point, I should have mentioned earlier but the bore is intentionally off centre to allow for the port face
I'll probably get the milling done on the sides and the ports drilled tomorrow but for now I think it is starting to take the shape of an engine