What is zero tension on the spring controlling the secondaries on the Q-jet. Say you loosen it up so the air valve flops open then slowly tighten the screw until the air valves come to a close. Is that point zero tension? Or if you slowly let off on the screw driver it will come back a little from spring tension. Basically is 0 when the valves closed with the screwdriver in, or valves closed and no screwdriver holding the screw.