I have a Compak K6. I disassembled the burr assembly to clean the grinder. I unscrewed the 3 screws which were holding down a tight spring. These screws are slightly shorter than the screws used to hold down the grind regulator. When I screw back the 3 screws holding down the spring, how tight should the screws be? I left approximately a 3mm gap. From what I gather, the spring controls how tight the grind regulator turns. Is this correct?