There are two basic methods of rigging your speargun when using a closed (South African) muzzle. The most common is the "Standard Wrap". The other method is the "Overshaft Wrap". The "Overshaft Wrap" method of rigging is similar to the effect of an open muzzle in that the line holds the spear tight to the rail, even when upside down, thus, allowing for shots to be made while upside down or at odd angles.

Standard Wrap

Overshaft Wrap
FOR OVERSHAFT WRAP ON CLOSED MUZZLE
STEP 1
Connect the 17” shock cord to muzzle

STEP 4
Re-install the spear into trigger mechanism and route the mono up the barrel through the muzzle, back down the barrel, around the line release and using a 2nd double barrel crimp, make a loop where at the ½ mark previously made on the barrel (see basic crimping techniques).
STEP 5
Remove the spear and attach the newly created loop to the swivel clip. Then re install the spear.

STEP 6
When loading the gun with this "overshaft wrap rigging method", the shock cord is wrapped over the spear before securing the mono onto the line release. The spear is then held tight to the rail, even when upside down.
