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I explored the pump concept a bit more.<br><br>This time I made one out of cardboard, entirely with desk tools and materials. No Thera band, no scroll saw, no screws. <br><br>While cardboard, if used right, can be incredibly strong, it is a b..ch to work with. You really have to take care. <br><br>The shooter holds 12 two-eurocents-coins in the mag. You can also use US dimes and M5 washers, all having about the same dimensions. <br><br>It is impressive how much power this little thing has, propelled by just 10 normal, thin office rubber bands. <br><br><embed pluginspage="http://www.macromedia.com/go/getflashplayer" src="http://www.youtube.com/v/_rCexho3sSE" width="425" height="350" type="application/x-shockwave-flash" wmode="transparent" quality="high" scale="exactfit"></embed>