About this 3D model

I tried to print a tool to remove the gear on a motor shaft (remembering to have seen one but can't find it again)... But that didn't work (contrary to hammering it with an M4 screw while safely holded in a vice). [edit 05/11/2012] Just use a vice : http://youtu.be/pT2zk--KqBo [edit 01/06/2012] Now may work :)