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Experiments with FE126/127 phase plugs have led us to decide not to make phase plugs for these drivers (make note of the last paragraph). Earlier fears that the FE103E may have the same issues seem to be unfounded with a number of people reporting success.
The way that the lead-in wire is connected to the voice coil is such that it is far to easy to kill your driver during clean-up after the removal of the dustcap. (See diagram). This is unfortunate because there was a definite improvement with the few drivers that survived surgery (we have 4 of 6 drivers dead).
The void between the dustcap & the voicecoil former is filled with a black glue -- in all 4 cases some of this gets on the inside of the voice coil former as well. This overspill rubs against the phase plug so it's removal is necessary. We successfully had 4 FE127 playing with phaseplugs, but more aggressive work to clean up the black gunk near the top edge of the voicecoil where the lea-in wires are resulted in the connection from the outside world to the voice coil to be severed.
I would like to thank Bill Perkins of PEARL for dong the surgery that revealed this failure mode (he is also going to attempt to repair the ones we didn't dissect)
DIYers being what they are, some intreped souls have figured out how to successfully remove the dustcap. Check out this diyAudio thread for more detail. We will be revisting this ourselves soon (too many tasks, too little time :^)
