Balance it across a socket extension or other rod. It should be obvious, as there are only three bolted positions which would give this a heavy half. The middle one will be right, also leading to the greatest imbalance.
That's how I balance mower blades when sharpening.
Interesting that you mention that. A member on the BMW Tech list suggested I used a blade balancer for this purpose, so I placed an order for one and it should be here tomorrow. Nothing like additional confirmation to raise the confidence level.
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