To many gaskets will move the diaphragm further away from the magnetic pull of the coil and to close can cause the diaphragm to bind on the rim. This is what I have found when trying to adjust them.

And one more thing. The diaphragm is dished, so which way should it be installed. I have read other descriptions of this but the terminology is different every time so I’m still confused and can’t seem to come to a clear consensus. This would also affect the airgap unless you adjust that from the rear.

To make it clear, even to me, should it be installed so that my tears of frustration collect in the bowl of the diaphragm or so that they run off? :sob: