Ah, Larry,
You know me well!
I have the design with the fitter; he will deliver a quote in the next 24 hours, and then production will begin.
I'd say two or three weeks at the most. But not sure yet on cost. It will use mild steel throughout with M3 grub screws. Extension from existing shaft will be at least 250mm, permitting use with deep enclosures.
Cheers,
Hugh