Steve, Jim. Thanks for your kind comments!
Well..... I'm still here Chaps!
Isn't it amazing, how life gets in the way of progress!

Modding a handy electrical conduit widget. I fitted the compound slide to my little lathe, and extended the outer taper, at 2.5*.
Then bored the inner taper, at 2* to give a slightly thicker wall, at the head end........

Made a disk, to suit the cylinder head pattern. Recessed to suit the tube.
Silver soldered in place. Tidily. Using minimum flux and wire.......

Milled a 10mm slot, and assembled........

And. It's working even better, now.......

Can anyone tell, what I'm muttering about? It seemed quite relevant at the time!

The engine's in pieces now. Being smartened up.
I don't do polished n shiny. But it will look a whole lot better when next you see it.

Thanks for dropping in!
David D