At one time Mr. Jett mfd. a high torque, big lumber turning 1.00, to this day I wish I had bought one and had AJC make a head for it. It appears that he doesn't make a 1.00 at all now.

Correction, I found a 1.00, not the high torque version though.
http://www.jettengineering.com/engines/bse100.html