That's normal for balancing a crank. You'll notice they're on almost every counter weight. Ideally you would balance the crank when changing any of the rotating components (pistons, rods, rod bolts). If it is a completely stock build you might be able to get away without it, as I'm sure the variation in rod weight isn't enough to cause destructive resonance. If you want to do it the right way, nearly every engine machine shop will know where to send it to be balanced. Most don't have the capability in house due to the expense of the machine. They will generally need: Crank, rods, pistons, rings, pulley/dampener, flywheel/flexplate to do it properly.
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