This is the pedal I built: https://www.thingiverse.com/thing:1394639
Adding your connection point can be as simple or complex as you want. If you're the down and dirty type, you can drill a hole offset from the centerline (not accurate), but it won't cross the seam (hah!) of the trap itself, leading to a more secure connection. If you want it centered, I'd recommend reinforcing the seam before drilling.
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