Closed Speargun Muzzle Rigging with Standard Wrap and Overshaft Wrap

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

STEP 1
Install 12" bungie (shock cord) to muzzle. Using a piece of tape, mark the barrel where the swivel meets with no tension. Then mark the tape where the swivel meets at full draw. Then measure and put a mark half way between the two marks.

STEP 2
Using a double barrel crimp sleeve, connect the mono to the spear or "dog house". (see basic crimping techniques)

STEP 3
Re-Insert the spear into the trigger mechanism and route the mono shooting line up the barrel and through the muzzle, then back down the barrel towards the trigger mech, around the line release and back up the barrel and form another loop (using a 2nd double barrel crimp sleeve) at the middle mark you made on your barrel. Finish by attaching the shock cord swivel clip to the newly created looping your shooting line.

STEP 1
Connect the 17” shock cord to muzzle

STEP 2
Install the spear and route the shock cord over the spear and down the barrel. Then make a mark where the swivel clip meets the barrel with no tension. Next, make a mark on the barrel where the swivel meets the barrel at full draw. Finally, make a mark ½ way between the two marks.

STEP 3
Remove the spear and using a double barrel crimp, attach mono to spear (see basic crimping techniques)

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.