I also use the Felt Tip marker method.
I paint the wheels with the AB. Then I glue the two halves together .
After that, I have these shishkabob sticks. They serve other purposes, like glueing, but in this case I cut a part of pointy end off of a few. As above, they hold by friction.
I wanted a "sharpy" with a sharp angled tip, but didn't find what I wanted until I went to a local art store. For a couple bucks, I bought a "Staedler permanent Lumocolor B".
Use what ever you want, but this works best for me.
Anyway, I hold the pen in one hand and spin the "kabob" in the other and "paint" the wheel. Because of the sharp angled tip, I can do the edges too.
It is quick and easy, I set the wheel/kabob in a container and let the wheel dry while I go onto the next.
I have a problem with shaky hands, and this makes a delicate job easy.
Oh, and apparently, the pen can be refilled.