1 - 2' X 2' piece of 3/4" plywood
2 - 2' long 2" X 4" boards
1 - metal electrical box
1 - No. 4 test tube stopper
1 - 3" truck valve stem
1 - metal washer
1 - hose clamp
1 - industrial adhesive (E6000 or similar)
1 - 18" - 1/8" metal dowel
Nail the 2"X4"s to the edges of the plywood. This
is the base. Drill a
hole through the center of the no. 4 test tube stopper
just large enough
for the truck valve stem to pass through. Drill a
hole through the plywood
and electrical box just large enough for the valve stem.
Stick the valve
stem through the stopper, washer, electric box, and
plywood. Use the
adhesive to help hold it in place. Attach the hose
clamp to the valve stem
sticking through the bottom of the plywood base.
Tighten.
Bend the metal dowel in a U shape. This is the
firing pin. Slightly warp
the firing pin so that when the pin is slid through the
holes in the electrical
box, it will hold the lip of the plastic bottle down on
the test tube stopper.
This launcher will fit 2 liter
plastic bottles, or any other bottle with the
same size neck.