I have a pair of KEF 104/2s that sound "pretty stunning" to me. That rod would deter me from any attempt at a DIY fix were I so inclined, which I'm not. These are speakers are worth having repaired properly.
I would suggest that you get them rebuilt by a professional. The 104's is finiky speakers and a different driver will affect the sound in a great way. Usually any speakers don't sound good/same after an 'aftermarket' replacement driver.
They will however - if done well - sound pretty stunning after such a pro-repair.
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