Ive been messing around with mini cannons for a while (mainly the purrell mini). well i finally made something on my own. its very simple but affective. hope you like it.
http://i111.photobucket.com/albums/n146 ... cannon.jpg
Parts:
1 large Expo Marker pen
1 reg. pen
1 small nail/screw
1 small hammer/ screw driver
1 push button BBQ igniter
1 pair of pliers
instructions:
1.) use the pliers to pull of the back of the expo marker. take out the ink inside the marker tube and just throw it away (you have no more use for it). Then use the pliers again to pull the felt tip out of the smaller part of the tube.
2.) Next either use the pliers or your teeth to pull both ends of the regular pen until its just the pen tube (used for the barrel). use the pliers to loosen up one of the ends of the tube (make it slightly larger, don't to big or it will just fall off)
3.) take the loosened end of the regular pen and put it over the small end of the expo marker. (if its too loose make the barrel over again, it should have a tight fit to it)
4.) take the nail or screw (which ever you went with) and make two holes parallel to each other near the back of the large part of the expo tube with the hammer or screw driver.
5.) run the wires that connect to the BBQ igniter threw the holes to were there about an eighth of an inch apart so it can arch. use duct tape or electrical tape to secure the wires so they don't flop around or fall out.
6.) load rifle via barrel, load fuel threw back of tube, put back of tube back on, aim, and click (fire). (easy as that )