Thank you Mike
I thought that it was going to be easy to add the spring and bolt on the valve casting so that I could make the Valve base
First I found that I had counterbored the fixed valve plate on the wrong side
So that had to have a piece silver soldered in and for the other side to be counter bored. This proved the two ports needed a bit more hand filing to provide adequate flow.
Then I discovered that because the casting was a bit small over the three mounting lugs on the valve casting and I had brought the three studs in, their nuts got in the way of joining the fixed and moving plate
I got round this by using 8BA bolts with 9BA heads, rather than studs and reduced nuts (bolt heads are thinner)
Even so I still had to reduce the diameter of the fixed valve slightly to allow the reduced bolt heads to fit with the valve with its moving plate snug against the fixed valve.
Just to ice the cake the next issue was that the Spring pin was too long and needed shortening. At this point the sun came out and the garden called me out to play
The result of all of this is I did not had time to make the base for the valve, consequently I have been told that I have failed to achieve sufficient progress on this engine to be allowed to see any potential next set of castings and someone is sitting on his new acquisition to making sure I don't get too good a look at them either. I was sure in the old days that we had a tradition that Thursday was casting fondling evening
Jo