I imagine that many of you have already studied n75. I have several questions: on certain models there is an adjustment screw while playing. I understand that this changes the 'frequency' speed of the actuator by moving the body of the solenoid. On the other hand, concerning the sealing of the metal piston against plastic, I find it crap. Yes, N75 does not leak if I blow through my mouth, but if I blow 1 bar (bicycle pump) it always leaks. There is indeed a restriction on the turbo pressure inlet. The question I ask myself is what amount of pressure passes through n75? because inevitably at a given moment the pressure on the small piston/spring opens it