In the past I've used a small lathe to produce dowel for a similar purchase (see rosewood turnings.) Although you can purchase high quality dowel plates, it's actually not too hard to make your own. Today I'm going to use a shop made dowel plate from a tip from Hendrik Varju (from Passion for Wood.)
Simply take a spare metal bracket, a high quality drill bit, and drill the size you want. In this case ~10.5mm.
Being careful not to waste wood, I cut 11x11mm pieces. (The missing section was the test piece.)
Next you need to whittle or shave the piece to rough shape taking off the corners.
The dowel plate makes the final shape as you move the piece gently through with a big hammer.
Three down... seven to go. As always I'm happy to hear any comments or suggestions.