Edit: SO I can find some. Goddamn phone keyboards.
I need some nuts like bicycles use for seat posts and axles that have a lever to quick-release or tighten them. I need them in a larger size though.
Allow me to 'esplain... I made a sliding cargo keeper for the bed of my truck. It uses the rail system that was there. That rail accepts a T-Slot nut or the head of a bolt. So, my plan here was to use the head of a 7/8 bolt in the rail, thru a flange on my "wall", thru a spring and into one of these nuts so I could easily move/adjust it and clamp it with one hand to keep things like gas cylinders and fuel jugs from sliding around when I need to.
All I can find are bicycle axle sets and wee little metric ones.