Lever paddle for (old) Conn 14H

[Gribnes]

The circular bar measures 6.25mm/0.25". Looking for a adjustable thumb paddle that I can position and rotate freely. New Conn, Bach, Curtois are all too small. I am drilling out an Edwards black plastic cinched cylinder but am perilously thin walled. Closed cell tubular foam kind of works but is a wee bit cludgy in function and appearance.
Any direction is appreciated
Jerry