I just laid this out in a drafting program. It looks like the rivets you have between each cartridge loop actually lever material back up through the slot and loosen the fit. The normal, non-riveted designs, like in Packing Iron do not have this feature or problem. Your loop leather looks thicker in proportion than the PI illustrations. Dwight, any thoughts on this analysis? Piqued, peaked, peeked?
God bless