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You have to stick the hobbed bolt inside extruder the other way around.
http://reprap.org/wiki/File:ToyREP-61-Hobbet_Bolt_With_Gear.jpg
http://reprap.org/wiki/File:ToyREP-68-Installing_Hobbed_Bolt.jpg
http://reprap.org/wiki/File:ToyREP-70-Installing_Extruder.jpg

Pick the right gear for your hobbed bolt from thing files per the distance of groove to hex head. Use washers to align filament and the groove. The filament will lock the position so there is no need for nut on the other side of the extruder and you will avoid this kind of collision.