Trying to manipulate the film lead from the diaphragm through the hole in the solder terminal with a small screwdriver, I inadvertently hovered the tip over the gap. The magnetic field is VERY strong there, and it pulled the tip down onto the thin section of the diaphragm and dinged it nicely. I'd have had to be holding it with two hands to control it.
Answer: plastic tools and toothpicks for that stuff, once inside; plastic tweezers for manipulating the film leads, if necessary.
ALSO, you let the phase plug rotate under tension when you finally tighten down its screw from the rear, and the diaphragm is done. It's much smaller in 076/2403, 2404, and 077/2405, and more difficult to grasp securely. Further, the conical phase plugs of 076/2403, 2404H, and H-1 are each dimensioned differently. Yes, it matters.
Finally, conspicuously missing in that tutorial is performing the requisite sinusoidal sweeps to listen and measure for response anomalies. Alignment, even within the limits of the "self-alignment" itself can make significant differences. Tolerances are tight, and in difficult instances, this must be done during the processes of tightening the phase plug and front plate, both of which capture the diaphragm. Prior to installation, carefully inspect the voice coil for contamination, glue residue, and roundness. It's all got to fit and float freely in the gap.
Yes, if the bullet tweeter is blown in the band's floor monitor, slam a new one of indeterminate quality in there to get it back up running for the next gig or rehearsal like that, but if we're talkin' precision monitors or critical listening at home, you have to pay more conscientious attention than illustrated to these elements.... :yes:
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