At one time I had a guide that showed each VEX screw length and how many pieces of metal that it would hold. It did flat parts, C-Channel back to back and across both sizes of C (1x2x1 and 1x5x1). It had common combinations.
It was helpful for new builders in getting the right screw lengths for what is being assembled. I’ve managed to misplace it. Does anyone have a copy of it laying around?