Rather than purchase bench dogs for $10 each + shipping, I went ahead and found some spring-loaded door latch roller balls on eBay and made my own using 3/4" oak dowel from Home Depot and leather scraps from a bag I purchased at a local craft store.
I used the band saw with stops for all of the depth cuts and a drill press for the roller ball holes. I Gorilla glued the roller balls and just used a little Titebond for the leathers. It took about an hour to complete all of these, including drying time.
You can read more about them at http://MolnarOpus1.blogspot.com
Woods: red oak
Darin R. Molnar