Flywheel locking tool

[John Mason]

Hi to all, I have an oil leak which I suspect is coming from the rear main seal ( Some years ago I changed to a modern type lip seal). I think this is where it is leaking. I intend to tackle the job by removing the gearbox out through the passenger side of the car something that I previously did when renewing the clutch. This saves time as the rad, exhaust and cowle do not have to be removed.  My problem will be trying to stop the engine turning when undoing the flywheel nut.
Does anybody have details of a home made tool that bolts to the flywheel that can be used to hold it firm whilst both undoing and tightening the flywheel nut.
Just as an after thought does having a new Phoenix crank effect the new lip type seals.

John Mason