Bob,
Mike SOhm (magnus) makes these heads, I'd be suprised he'd let them go, after all he has one helluva reputation.
A tip for sharpening, I havent tried it yet on anything other then spoke shaves, plane blades, and my bowyers edge blade.
Use sand paper to sharpen on!
Start out with your file to get things trued up.
Take piece of glass, or an endtable what have you, and lay a sheet of paper on it. Start with 150, then 180, then 220, 400, 600, 800, 1000, and 1500 grits. Use wet/dry paper, should be able to find in automotive stores easy enough.
I have a hankering this might be my solution to the WW sharpening wo's I have with a file alone.
If you want this sharpening method for blades, look up scare sharp plane blades, or scary sharp blade sharpening, you'll find it. It wokrs like a champ. Obviously you wont need the veritas jig for doing your bowyers edge or your WW/snuffers. You will need something for doing blcok plane and spoke shave blades.
It's really quick, much quicker then youd think. Once you get to 400 grit it's super fast to polish, so if you notice at 150 or 180 you aren't quite flat yet, either go back to a courser grit or keep working it before going finer. It really polish's and edge!!!!