Small crack in center of 12" subwoofer? best way to repair?

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Theres a small crack if I press on the letter (logo on dustcap) in the center of both of my 12" subwoofers. I dont know how it go there but I want to fix it.
I tried hot glue but I dont know if its going to hold and I dont know if its the best choice.
I can see the plastic seperate with about a half inch to one inch crack (very small in the center of both subwoofers. in about the same spot. on the 3D text logo.
I dont want to replace the entire subwoofers I just want a quick fix that will last and not damage anything or make the sound quality bad.
 
If you want a repair you can't see, and replacement caps aren't available:

Heat the cap with a hair dryer, then carefully peel it off.

From behind, spread a little wood glue, then lay a small piece of tissue paper across the crack.

Re-apply the cap. - Ideally with re-coning glue, so it can be removed again if ever needed.
 
Theres nothing to peel off. the entire subwoofer cone is the dust cap. including the area in the center. its all one piece. and its some type of plastic-like material. I dont want to burn it with a hair drier.
all I have is hot glue. which I know can be removed effortlessly by putting some alcohol on it with a q-tip and letting it soak for a few minutes and repeat if necessary.
 
definitely not use super glue on speakers. I realized that in the past when trying to bodge a small plastic dome as a dustcap for a small rectangular TV speaker.
destroyed the thing so bad. totally wrecked the cone where it connected to the voice coil. crumbled to dust. it was a similar material to my subwoofer too I think. so I dont want to even try that. the vapor would make a white dust all over the area around where its been glued. and its possible the glue would seep through the crack and get between the voice coil and pole piece gluing the subwoofer down or making it scratch horribly.
 
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