sure I did that on mine , just pull the original ones , you might use a soft leverage ( use a wood tool or some fabric not to damage the paint )
I ordered standard metal knobs for mine ( on Ebay or Amazon ) , the large ones need to be screwed ( visible one the master volume )
pics :
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another pic , including the one I sold to Michael Wagener ( Red box )
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Looks nice 
Yeah for sure, beauties there, Renaud!
Hey bud...those coloured covers look cool.....how do you get spare covers ?
Hey bud...those coloured covers look cool.....how do you get spare covers ?
thx , I had an arrangement with the mothership , but that was an unique batch ... sadly, only 6 in the world 
If The team is listening & is ready for another similar arrangement , I could arrange another batch , with pro finish this time , like M Wagener's one.
some knobs off have set screws did you get push and pull or set screws knobs
small one push/pull
big ones set screw if I recall well
