spray some hair spray on the knob and let it soak in for a couple seconds, then try to wipe/scrub it away. many inks are soluble in hairspray, but the hairspray is often less extreme of a solvent than rubbing alcohol in case you are afraid the alcohol may strip some paint as well as the sharpie.
"The two seater is being joined in a few weeks by a larger two-plus-two model with a rear seat for munchkins." ~Jim Mateja, Chicago Tribune, in regards to the Z32.
Andrew Janeshek // jnshk@aol.com // 1992 NA 2+2 [Stage 2-ish]