Hi I use a Marine propeller hanging static balancer. I then drill holes same as the manufacture to balance.
Other suppliers of "Lightened" props do not balance there flywheels. There are no balancing holes drilled on any of them.
They also don't remove that much weight. For example a simons motor sport flywheel for 200/225/250/300 optimax engines weighs 14.5lb.
I can make mine just over 11lb, At this weight you won't have engine stalling on tick over and trouble spinning big props.
If you want one made lighter, it's no problem.
No we don't crack test, we use the stock flywheel to lighten and there's still plenty of meat left on them. If you want one weighing sub 9lb then you might want to consider it.
I can lighten your own flywheel if you wish, takes 4/5 working days, plus postage time.
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