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jamval

Audax HD12x9D25 Voice Coil Diaphragm Replacement?

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I have a set of Audax HD12x9D25 soft dome tweeters that are not working. I don't see any broken leads or anything that looks burnt, but they don't work, no continuity, test open.
Here's what they look like:
IMGP2167.thumb.JPG.5090a242f87815f16dd80bb385c3941d.JPG

And taken apart:
IMGP2169.thumb.JPG.2654ae0eaf4f1e0e4119c1570606d4be.JPG

The existing coils/diaphragms are in a plastic holder.
DomeAssy01.thumb.JPG.394ca5f8bea73e91451bde31e1ce85f5.JPG

I will strip out the bad diaphragm salvaging the plastic holder:
Holder02.thumb.jpg.06465472117cb391ec5d27cfb5474d49.jpg

I can get new voice coil diaphragms like these:
Diaphragm02.jpg.59ad88ec9e96bdef6958bf29e5f39869.jpg

The question is how to make sure they are centered in the gap around the pole piece?
Will this method work?
First place shims around the OD and ID of the gap (I would use more shims, this photo is just for illustration):
IMGP2173.JPG.d81f483092a067bf28cfa92ff6bfef96.JPG
Next, after stripping out the old voice coil diaphragm, place the plastic voice coil holder on the magnet, there are two little posts that pressure fit into holes on the plastic holder where the red arrows are:
ReadyForCoil.jpg.eb29f71d9d5b898f2aff893b6998b6e9.jpg
Then place the new voice coil diaphragm into the gap, and glue it down to the plastic holder.
Last, remove the assembled holder and new voice coil diaphragm, remove the shims. Attach/solder the lead wires to the terminal connectors. Put it all back together.
Seems too simple, will this work? BTW this model tweeter does not have the ferrofluid.
I have replaced a fair number of foam surrounds on cone drivers, but have never done one of these.
Thanks for any advice.

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