The 0350 makes an AWESOME manual flipper. I greatly prefer mine without the assist. They open so smoothly that you will wonder why the torsion bar was ever needed in the first place. The 0300, on the other hand, does not. Since it does not have a stand-alone detent like the 0350s, removing the torsion bar means you have nothing in place to hold the blade closed. This leaves you with the option of an extremely tight pivot, a free swinging blade, or drilling a detent hole yourself.