hey dude, this is pretty cool. you should really try to make it actually shoot. if you did and it worked, id give you a five. 4 for good effort;):P. you jsut gave me good ideas for a better ballista than what i've had in the past. mkae tension on the arms by wrapping rubber bands around one end of the arms then slip them through holes in those plates that have holes in them. then put string accross the tips of the arms and voila, it should work. probably not very good..but keep going from there.