If you have access to a big lathe it is fairly easy to cut down the counterweights. Calculate how much bobweight needs to come off and then convert that to cubic inches of steel and you'll know how much depth to take off. We cut the counterweights down at the shop when we have to take off a lot of weight since drilling big holes in the crank is a bad idea. Once you know how to do it the task goes pretty quickly. If you do the calculation correctly you can often hit the balance number very closely so the final balancing only requires a dimple or two.
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