Cheers Guys
On with the cylinder, I had a bit of 31.5 mm diameter ally in my stash a little undersize, but if I didn't clean up the OD I recon it will do the job, so faced a chuck off to lenth, then drilled and bored it out 16mm ID
The using the four jaw with the cylinder longwise face off one side for valve chest.
Turn it round 90 check that its square and face another side off for the base
Over onto the drill and drill the ports
The spotting off the valve chest drill and tap M2
Then from the end face drill down 3mm into the inlet port.
The use the end covers to spot through for drilling and tapping M3 for the end cover fixings.
Thats the cylinder done
Time for a quick assembly of parts to see how its looking
MMMMMMMMMMMMMMM not bad
Stew