Original Capri radio - knob

Guys,

on the weekend i installed an original radio into my Capri - it looks great and fits perfectly. It does however have one of the knobs missing. I have tried other knobs of a similar vintage but they dont quite fit properly. My only real option is to get Kev from Capri Clinic to make a new one up from mould injection but thought i would try on here first. I know its a long shot as there isnt many of these radio's around - but if someone does happen to have a spare one - or maybe they have a radio which is totally shot and they dont need to knob any more, i would greatly appreciate it. It is the knob which goes on last - on the end of the spindle, not the one that slides over it

regards Paul