Duane, if you don't want to tear it apart and drill the holes, then just leave it alone.
You can't put a hole in the top, the axle inside will keep you from sucking the oil out. I suppose you could drill a hole in the lower part and thread a plug, but you better guess right on where to put the hole on the first attempt. Axle is pretty thick, and odd shaped. Plus the oil that is in the tubes has no way to circulate back to the rear. Drilling holes in the rear housing allows the oil to circulate.
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