https://youtu.be/e9GSTO-4Txo?t=119 is a This Old House fold down workbench (among other things). The knuckle of the leg hinge (at 1:59) appears to be pointed into the 2x4 of the table top frame. If so, how did they get the hinge to lay flat? I'm talking about the leaf that goes against the table top, and not really the table top, just the frame.
It seems to me they could have used a shim to support part of the hinge; although, I see no evidence. So maybe it's a special hinge, a hinge that's different than what I have?