I don't bother with tubes; I just hold them loosely in the hands. If you can't manage well enough then try Bic biros with the insides ripped out.
I think your explanation of the position of the rods was a little misleading, you said they should be held perpendicular to the ground and parallel to each other. It depends which part of the L-shape you are refering to. The part that's held in the hands needs to be perpendicular to the ground, but the part pointing out in front should be parallel to the ground. I mention that just in case some would-be dowser should think that his rods need to point vertically downwards.
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