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All the ideas are great but think funrunner hit the most basic idea. Put a wood 2x4 under the flywheel and put the least amount of pressure possible against the flywheel teeth with a pot jack or any jack.
The teeth on the flywheel or the starter ring teeth will be held from turning with mild lifting pressure. You gain advantage from the folcrum or distance from center as an added bonus. The other ideas seem good too but take another hand to hold many of the options like a prybar on ring gear teeth. GOOD LUCK
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