Wow I certainly wouldn't recommend doing what Ty has suggested not on a model 1 or model 2 Rotomo. Doing that can so easily break the ignition plate and flywheel.Unless the flywheel has moved you won't be able to get screw driver between the flywheel and the ignition plate as their is a lip to stop that.Best to go to bunnings and get a harmonic balancer kit (or some other puller set-up),I think their under $20 now.For if you break the ignition plate or flywheel good luck on finding any thing good.In fact good luck on finding any,any that you don't have to buy a complete mower just to wreck.
Here are the pictures of the ignition and ignition set-up.I hope this helps.
If you need a picture of the flywheel just let me know and I can take one for you.

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This is how the coil pack looks off.
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Condenser.
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Points.
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What I really like about these mowers is the points were made to be serviceable.Here it is apart.
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This is the top view.Hope this helps let me know if you need more info,happy to help.

Here for a good time,not a long time.