On the seat, you have to sit on it while you turn the handle. I think there is a spring or something that you have to go against.You can lower it without sitting on it, but its hard. I tried all kinds of stuff to get the vent windows to stay open. The only thing i got to work, was to put a strap with velcrow (sp?) and strap it open.
And you can use some hose with 1/8" ID. I hope that helps some! And the factory jacks not that great, i would try to find something better. <img src="/forums/images/graemlins/cheers.gif" alt="" />

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