Well there goes your warranty!Got it. I had to push the heel to the side to lift out the tab held by the torx screws.
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The sliding-then-rotating mechanism is pretty clever.
But man, this thing has a lot of springs. 2 for the main clamp, 1 for the lateral movement, 2 for forward pressure, 1 for the adjustment tab, and 1 or 2 I can't see in the rotating piece. There must be an opportunity for a simpler design.