I have had a bit of interest from a few re my home made Articulating Hollower. If you would like to give making one of these a go, follow this link, I have put up a doc with instructions and parts needed…
I have fixed the link above, so sorry for the screw up.
-- Syd Sellers Old woodturners never die, they just keep chipping away! http://www.rocky-roost-woodturnings.com