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This is a shape mod of the grimace puzzle origionally built by Smaz on twistypuzzles.com (topic here:http://twistypuzzles.com/forum/viewtopic.php?f=15&t=15015&hilit=grimace). The only real difference between this version and the origional grimace is that this one is shaped like a barrel. you will need a 1" #4-40 screw and a nut to complete this puzzle (Note, one of the areas for the screws is shallower than the other. This is the area to put the head of the screw or it will not work. I made this design change because 1 inch screws are easier to find than 22mm screws).