Dremel?

 

sandflex blocks might work. you need something conformal that can get right in there. You might think up something that attaches to the end of a spindle so that you can attach it to your drill press and make the work semi automated.

 

Round nose ball mill for your dremel or one from MCLS made for a milling machine(but used in your drill press). If all else fails, paint them black.

Sometimes you have to MAKE a tool to do a job. Next time you drill those holes you may try making a D bit to drill them out. They'll end up as round bottom holes, which you don't get with a twist bit.

 

I've had success by wrapping a piece of sandpaper around a drill bit - probably a size smaller than the hole in your case - and elastic banding it in place. To get the bottoms done too you'll need it to project a little beyond the end, but then it "works itself" into the hole. You need to wind it the right way around, and it's best if possible to use a variable speed drill and go slowly.
Might work.

 

If all else fails you could try filling the holes with coloured epoxy. Wipe off as much excess as you can and then use a card scraper when the resin has set but is not yet at its hardest.

 

On a side note, I got lots of complaints about my store-bought dominos…the 'twelves' version, because the holes were all painted black. I tried an artist's brush, q-tips, nothing would work….until I used the hypodermic needle filler to an inkjet cartridge re-filler kit. Just sucked up assorted acrylic paints, and filled the holes on all the 7 and up dots with their respective colors with it! Easy!

 

I bet these would do the trick:

http://www.woodcraft.com/Product/2004626/8132/Sanding-Cone-wfive-80-Grit-Sleeves-and-five-150-Grit-Sleeves.aspx

 

Vicki: Thanks for the tip! That may just do it.

I'm not going to paint or fill the holes. I use maple vernier over walnut so that I didn't have to paint the dimples. The problem is the substrate from the PSA vernier. The adhesive "sheet" on the back of the vernier doesn't drill well and leaves a little behind. The dimples need to be sanded a little to remove the adhesive "hair" that was left behind.

 

Thanks for the tips. I had to go to town this afternoon so I stopped at the hardware store. I purchased a Dremel cutter, No. 192, that worked quite well. It's the one that looks like a ball on the end of the shaft. It really cleaned up the dimples quite nicely.