I think the Mr X method was :
engine on rollers
Chalk at the ready, using a rest, and just kiss the flywheels.
Shutdown, and add some weight, restart and try again.
I've forgotten if you add weight at the chalk mark, opposite, or halfway inbetween. I've searched, but never found the original posting, just hints about how it does not work if there is a lump in the flywheel. Some have pulled the head, and spun with a motor to get rid of the ignition pulse.