Allan,
I've been using my coarse and x-coarse DMT hones with the Sharpmaker. I just prop the hone up against the ceramic triangle sticks and hold it there. It works just fine, and I get my initial cutting done really fast.
I use my DMT hones strictly dry -- no water. They cut fast and easy, and has the advantage of not making a mess when propped up against the Sharpmaker.
There's an old article of mine entitled "How to Make the Sharpmaker Perform" on knifeforums.com Knife Reviews Forum. It's relatively near the top of the forum, probably no less than 10 days old. Don't use the automatic search feature (it fails), just zip straight to the forum and look for it by eye.
Joe
jat@cup.hp.com