Marble Cannon

Items Needed:
2x4 wood 18in
1x1 wood 18in
Any type of wood block for holding
Wood screws
Tension spring
PVC pipe 18in
Wooden dowel rod 16in
Zip ties

Screw door hinge into both sets of wood

Drill holes 1in apart into 2x4
Drill screw into wood block to keep still

Place dowel rod into pvc pipe
Drill screw into 1x1 on side
Drill screw into wooden dowel
Zip tie pvc pipe with dowel in it to wooden 1x1
Place spring on the 2 screws connections them