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The shaft will likely fill with oil when the engine is off, though it is possible it won't. When the shaft begins rotating at idle the oil will be expelled out the holes. I thought about one hole (unbalanced) one through hole, and one almost through hole for balance (less oil in the shaft), or two through holes. I went with two through holes to move the oil out faster at idle. At the end of the day I'm not sure having the second hole all the way through makes any difference from an oil expulsion standpoint but it will balance more accurately.
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