[header] How to install a cartridge box sling (reenacting ) [title] Lay the cartridge box on its back. [step] Place the sling above it, with the breast-plate on the right side of the sling. [title] Flip the sling and cartridge box over. 
[step] Make sure that you flip both in the same direction. [title] With the rough side of the sling facing up and away from the overturned cartridge box, feed the right end of the sling though the right sling loop.