The instructions don't give enough information about placement of the lower three LH2 ducts.
You only make three dowels, 4 3/8" long. But it seems there are four places the duct dowels could go - between the tanks, above the stub fins.
I checked the Meatball rocketry site again and found which side doesn't get a LH2 duct dowel.
It's shown in the picture on the left. There is no fourth LH2 duct above the fully black area of the fins.
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