Tubular nylon works really well for holding up gongs. I have a gong thats seen well over 1000 rds of 223 and everything else and the nylon is still holding up. Its definitely taken its fair share of hits and bullet shrapnel. The nylon is attached to a pair of eye bolts.
I would imagine that old seat belt junks would be very similar.
I would imagine that old seat belt junks would be very similar.