Step 7: Assembling the outer tube and inner tube together
Decide how much travel you want the inside tube to have when you extended your LAW launcher. I decided for mine it would be a 5 inch travel.
I marked five inches on the side of the fiberglass tube. Make sure the two points are parallel to the lenght of the tube.
Make sure to remove the abs/pvc pipe.
Drill out the marks.
Draw a line between the hole you just drilled in the fiberglass and cut out a channel with a dremel tool. Watch out for fiberglass dust. it itches and you should not get it in your eyes or breath it. Wear long sleeves, goggles and a mask.
Picture #3: Insert the ABS/PVC pipe back in the fiberglass tube with the COUPLER ATTACHED. Drill a hole in the ABS pipe at the front portion of the channel you just dremeled out.
Picture #4: Put a screw in the hole. Now the pipe will only move forward and backward a predetermined amount (mine is 5 inch travel)and the inside tube will not rotate.