its pretty stupid.  here is what you have to do:  air out of the pipe like 3 or 4 feet, slide a flat rail and any other shape besides flat (kink, rainbow, curve, etc.), and do a 360.  It is so easy my friend who was born with gimpy thighs and can't walk right got certified
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'haha he told his parents ahbout his ginormous cock.... what a fag' - linemaverick540
'I wonder why haters tend to be idiots?' J.D._May