Questions to Refurbishing of Vintage passive Radiators

I have a damaged passive radiator of the Electro Voice Interface-Alpha.
There is follow issue:
The wight in the center of the diaphragm of the pasive radiator shown under
is torn away from the spider.

Follow question rises up:
Which adhesive has after curing the right consistency resp. softness ??
Is it possible to use the same material than by the refoaming of surrounds?
Thank you very much in advance for helpful hints.

This URL's dont provide the wanted informations:
ElectroVoice Inferface a: Refreshing
Designing with the New Creative Sound Passive Radiators - Part 1
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