[hteas]

Jim,
I'm fraid I don't see any photos.
You are probably talking about the shooting line. it should wrap around from the slide ring on the shaft in front fo the muzzle to the metal line holder on the right side of the gun handle, back around the muzzle, and loop around the back again. Typically they are of nylon, either mono or braided. At the muzzle end of the line there should be a rubber snubber to keep tension on the line. You will probably have to stretch the snubber a little as you pull the second wrap around the line holder on the handle.
If yu have some other setup you'll ahve to provide photos or a description.
One word of warning about JBL guns. The tighter the shooting line, the harder it is to pull the trigger. The line should have just enough tension to stay in place.