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How to install a cartridge box sling (reenacting )
Lay the cartridge box on its back.
Place the sling above it, with the breast-plate on the right side of the sling.
Flip the sling and cartridge box over.
Make sure that you flip both in the same direction. 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.