Well with a proper two forward one back amount of progress I think that I am now back to where I was pre Stafford.
When fitting the replacement combination lever I really struggled with the pieces of brass wire which I had previously cut and peined over to hold the various rods in place. After the 4th or 5th pinged off into space I got fed up and chucked up a length of 1.9mm nickel rod in the lathe and turned down some small pins. These combined with some etched washers that I found on a spare etch now retain the rods in place.
It was just prior to refitting that I thought that I had best remove the other combination lever and beef it up as I didn’t want lightening to strike in the same pace twice.
After soldering another strip of nickel to the back and filing to shape I happened to place the two combination levers together on the bench where I realised that the replacement was longer that the one that snapped. As luck would have it I was able to solder a small piece of scrap etch into the bottom end of the fluted section and then drill through to the correct length. The last job was to cut of the over long bit and file the round on the bottom.
These are the four stages of the operation but the good news is that it’s all now reassembled and I am subject to test running back to where I was and ready to fit the return cranks.