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Robbed this pic off an eBay auction for a detailed shift knob; they painted the indentations black, except for the R which is obviously red. Kind of a neat detail.
I've done this on numerous bike parts. You simply fill the indentation with paint and once it's dry you wipe over the part with a little paint thinner to remove any excess you may have gotten outside the grooves.

I've done this on numerous bike parts. You simply fill the indentation with paint and once it's dry you wipe over the part with a little paint thinner to remove any excess you may have gotten outside the grooves.