Instructables

Air powered trip wire paint mine 4 (trigger and finishing it up)

Step 1:

Make something that looks like this. Try to copy the geometry. You want the hinge to be close to inline to the tooth notch in the valve lever. Don't drill the safety pin hole yet!

Step 3:

Put in the screw to hold the bottom of the spring and attach the spring.
Mount the tent steak. You may need to drill and put a screw in to keep it from sliding.
Paint it up!

Step 4: Fill bottle

Make a fill bottle. 8" piece of surgical tubing, a water bottles cap, a small plastic nipple and a small hose clamp. Make this and screw to a filled bottle.