This should probably include a "don't try this at home statement
" and will, I am sure, attract a volley of H & S concerns, but in the absence of, or prospect of obtaining, a flywheel holder used a method that allowed me to get to the 116 lb.ft required. It says 'dodgy' and 'bodge' in the title so you have been warned...
I tightened a ratchet strap around the flywheel teeth with the free end at a tangent to the edge of the flywheel and secured to an 'immovable' object (a cast-iron down-pipe). The strap didn't slip, come off the the teeth or start to tear. (I did have to chock the trailer wheels though