The Revolution hollowing system now has a 5/8th shaft version that will allow for deeper hollowing.
The 1/2 inch 13 mm shaft will allow hollowing to a depth of 6 inches (150 mm) where as the 5/8th (16 mm) will allow deeper hollowing to 10 inches (250 mm). Although these depths are dependant upon the users skill, deeper depths can be obtained.
The new shaft can be view/purchased from my web site here.
New videos are in hand to show the tool being used covering specifics. However at the moment I am chasing my tail more often than I would like to be, so please be patient.
But if you have any questions you can always contact me via my web site.