Yard Machines mower: Nowhere for "T-bolts" that hold handle to frame to screw in

The "T-bolt", as referred to in the Yard Machine's Operator's guide, is a plastic top with a wide diameter on top of a skinny threaded metal bolt.

When you put the bolt through the bracket and then through the hole in the mower handle, the bracket has an area towards the top where only the threaded portion can through and the plastic top with the wider diameter cannot.

Then at the bottom, hard to see and photograph, there is no area for the screw to screw into though the operators guide says to "screw in the T-bolt".

The mower is usable without this T-bolt slid in (but not screwed in) but I can't help but think something's missing

 

Without a model we cant look up a manual to see what this is, get the model, google it for "owner's manual" and see what this thing is!

 

Model: B0BL729

From the operator's manual:
"Insert the T-bolts through the handle brackets and lower handle and tighten securely to secure the handle in place"

I figured since the T-bolts are threaded they're intended to screw in somewhere

 

That looks like the wingnut portion of the bolts that go through the handles about 1/2 way up where the handles fold. Have a good one. Geo

 

There is suppose to be a square nut in the slot below the handle.
Part number 712-04222 nut square 1/4-20