I learned that they design and manufacture/machine the cutterheads
themselves in Kentucky on a CNC unit and make several versions for
various machines. They made a DJ20 version a couple of years ago at the
request of a woodworker in Ohio, who sent them his factory cutterhead
as a template. I spoke with him and he swears by his new helical
cutterhead. Byrd is selling them for a hefty $445, so I doubt I'll be
buying one anytime soon.

Yes they are nice people took almost two months to get a generic 6" but still.
http://www.woodcentral.com/cgi-bin/m...es;read=213748
here is the post I made with pic's.
my only complaint is it tends to leave plane marks. those slight ridges you
see with a straight sharpened iron. but that is not a big deal. it cuts far
cleaner then anything else makes hardly any more noise when cutting then
running. cuts endgrain very well too.

Having just pulled my DJ20 cutterhead to replace a damaged table lip,
the installation process seems like it would take only 20-30 minutes or
so.

I was suspired how easy it was. the only pain was grinding a bit off the lips
of the tables and putting on the bearings without the right tools.

--
Knight-Toolworks & Custom Planes
Custom made wooden planes at reasonable prices
See http://www.knight-toolworks.com For prices and ordering instructions.