With reference to the Jones racer, in the April 2019 issue of TCM, Dennis Jones did indeed make his own front wheel but it was not a disc.
The front wheel he made is in fact still in the Supercharged four he also made.
This was unusual, in the fact the brake was operated through the wheel spindle.
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The wheel fitted to the twin in your feature, I picked up at Netley Marsh autojumble years ago.
It came from some of Maurice Cann’s stuff. I believe it is an experimental Italian hub, though I may be wrong.
Read more of this letter and other reader letters in the June 2019 issue of TCM – on sale now!