+1 for Maplin or RS Components (better selection)
www.rswww.com
You can get a black knob with a small screw on one side which would tighten on the flat face to give rotational grip.
Only a couple of ££ incl shipping
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Daily drive:
2016 Infiniti QX70.....a car that's even more complicated than my last Infiniti FX to modify 
Current 'Project':
VW Crafter CR50 4 berth camper van
Previous 'Projects':
2006 Subaru Legacy Spec 'B' 3.0R,
1994 Ex-MOD Land Rover Defender, now "civilianised".
2000 Audi S8 FL
www.whall.co.uk
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