I do all the time. They are my shorter ones, usually steel coasters, sometimes steel corkscrew. They are generally short, 1750-2500 feet, with 1, 2, or maybe 3 inversions. If it has 3 inversions, it's probably 1 vertical loop and 2 corkscrews.
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Hey, SFGAm management, can I buy a couple cages of Sky Whirl?