How to build a one-piece
folding picnic table out of 2x4 lumber
Step 7. Assemble the side-frames
Assemble the two side-frames (the working mechanism) as shown in the plan and picture below. The side-frames must be a mirror image of one another.
This is really just a matter of aligning the bolt holes, threading bolts (with washers) through the holes, and applying washers to the other ends followed by nylon locking nuts.
Tighten the nuts tight enough to allow the frames to fold, but not loose enough to allow sideways wobble.