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Aric-
If I remember right, the tubes slid down through some tabs with holes in them on one of the seat cross-tubes at or near the top. The tubes had a sort of notch in them at the bottom ends that essentially wedged onto a thinner cross-tube at about the middle of the seat back. Something like this drawing.
Do you have the plastic bits, etc. for the tops of the tubes? I'm pretty sure that other than the bottom notches there wasn't anything special about the tubes- no threading or anything. Adjusting the height, etc. had to do with the various plastic bits...
Tom
NYC
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