help with tubes collapsing in on me!!!

[duffygould]

well thanks for all the input there. Oh and to answer a few questions... I'm about 6'1" and only 165#. I've checked out the foam inserts in the seat and I do have them inserted the correct way demonstrated in the instructions. I'll have to try to find some plexi or something to insert on the bottom or just throw in a seat for rigidity. I'll do some experiments next week and post the results. Thanks everyone!
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