Hi all I am at the very end of a 4345 build and am eager to hear these beasts for the first time. Long story short I have 4x OEM 2421 Diaphragms made in mexico. I have 3x 2425 compression driver to play with but only one will accept the OEM phragms. You can instantly feel the former or voice coil is rubbing on something. I initially thought the phase plug must have shifted at some point so I bought another 2425 to try, it's even worse. Aftermarket diaphragms will fit comfortably in these drivers. Any tips on how to get this to work? I am quite pissed off none of my NOS diaphragms seem to work.