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The holes in the center tube may be plugged with sludge. Take a small wire brush or an old tooth brush and clean off the center tube or maybe an air gun.They are there although they may be difficult to see.
Bill in Conn.
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That makes sense.... I cleaned off a layer of goo about 5mm thick off the bottom... I really did look hard, but it seems the holes are smaller than I was looking for and as you say filled with sludge....