G'day Jeff and Norm,
It depends how much room is between the flywheel and the side of the mower frame as to if the motor needs
removing to get the flywheel off, either way shouldn't be too difficult.
I'm not sure if a module will work on this coil as I haven't tried it before but there isn't a lot of room even to get to the wires
so the flywheel may need to be removed.
Here is brochure that shows setting the points https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/103048/austral-villiers-power-reel-mowers-c1955.html
Because this is in Events - Past & Present I can't upload a pic of the flywheel and coil also link won't work you would have to copy and
paste into the address bar.
Cheers
Max.