Sorry I'm no help. I looked over Fat Bears site many moons ago and thought to myself "haven't had a problem there yet" and forgot most of it. I believe the pic posted of the button head screws in Looseman's Ghetto Trash build that ruudxd mentioned is the only real "secret". It just ties the upper plastic chassis/hinge pin brace to the main chassis. The rest I believe was just a guide to 3mm screw conversion and maybe using longer screws in some spots that go into the plastic chassis braces.