I really do not know why this is proving so difficult, or why you feel the need to add sarcastic undertones to every reply?
Mick Henmings was the authorised Quaife distributor.
Quaife did not / would not sell directly.
Mick has passed away.
Hence my question: do you know who now sells them retail since Micks passing?
It’s a simple question.
If you don’t know, just say so.
FE I think there is an important fact that isn't clear in your post, which may be adding to the ignorance of others.
Mick was not a reseller of Quaife built gearboxes. He built the gearboxes himself, to customer order, from parts supplied to him by Quaife and others (bearings etc).
For a significant period of his life, Mick's business was closed to casual customers on a Friday, because that is the day he spent in his workshop building gearboxes.
Quaife have not built Norton gearboxes themselves for decades, and possibly they never really did.
The only time I built a gearbox from scratch, in '75, I bought a 4 speed Manx 'cluster' direct from Quaife, 8 gears, nothing else, no shafts, no selectors, nothing.
I had to source everything else separately, mainly from a Norton dealer, and I built it myself.