Since the escape of the intake valve is carved in the upper part of the cylinder, I made it with leutor.
The left side is the genuine cylinder, the right is the self made cylinder.(It is a photo on the way of carving.)

I tried putting a piston.

OK！

I also confirmed the rattling feeling at this point, but there is no rattling feeling.
It was rattling when it was an old cylinder.
It’s a really nice feeling.