I got my self a rol of red PLA (it's a little bit lighter then the red color of the original knob, but it will do) and printed me a few power switch knobs.?
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The light switch knob is also a little lighter because the darker grey I have is almost the same color as the front panel.

The final result and I'm quite happy with it.?

For who is interested, I have added this story (and more) to my website :??
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73 Lex PH2LB?