Hey Adrian, your inbox is full.
is this still going on ?
I pm'd you the confirmation and shipping adress for the european Groupby in September, but nothing heard till now.
You also can get Marshall type knobs or Pultec knobs there. ;D
Delivery took a bit, but my complete order (>50 Knobs) arrived safely.
He only carries the ones without the brass insert though.
The transparent skirt is just attached to the knob and easily removeable.
I filled the outer ring with epoxy and threadend the knobs myself. Two M3 insert screws and you can attach them to 6mm or 1/4 " shafts. There is enough of the inner plastic to drill them as required.