Just got my first DE, and I have what seems to be a bit of a daft question: how tight do I tighten the razor? Just so that it's holding the blade, so that it's bending the blade, or just screw it down as tight as I can?
For your A 3 SuperSpeed- open the doors, place a blade in it, then twist the knob until snug. The "silo doors" should then be fully shut, and to open it after fully closing it, there should be a trace of resistance at first. Remember, just nice & snug, with fully shut doors. You don't need to put a Samson on it.