I can't quite figure out if the stud is part of the base, the rack tower, or removable and just connects the two... How does the stud work? Do you need to tighten it up with a tool every time you install/remove the rack?
On my similar through the roof permanently installed Yakima landing pad setup I don't have a vertical stud but the towers expand into the base, so no tools required. Yours looks even lower and more flush to the roof though.
URCHIN Portable Anchor
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