Maybe some West Systems G-Flex would work as well.

Its a 1:1 epoxy making it super easy to use.

https://www.westmarine.com/west-system-g-flex-650-8-liquid-epoxy-resin-and-hardener-9223132.html?&adlclid=f5de3e41a1d611976b3b5bb3b701 fab4&utm_medium=cpc&utm_source=bing&utm_campaign=% 5BADL%5D%5BPLA%5D%20All%20Categories&utm_content=p la-4577198194756147x1177578694761653x458244127&msclki d=f5de3e41a1d611976b3b5bb3b701fab4&utm_term=457719 8194756147

Regardless which method is used to fix the crack, I think it's important to look at why it cracked in the first place.
From my experience, graphite is pretty tough stuff to a point.
I think the cone may have been bonded to the surround in a non-stress free state, ie it was forced into compliance at that interface, putting it under stress it shouldn't have been under.
I would fix the crack using as little 'glue' as necessary to bond the edges of the cone together in a stress free state as possible. To me that would mean just adding 'glue' to the crack without actually touching it, just let the 'glue' fill the crack as is. After it has set, I'd bond the cone to the voice coil if it's detached there at all, and let that cure. Then I'd move to the surround part and 'glue' the cone to it, again not touching it if possible, just 'bridging' the gap such as it is.

While they were the size of a refrigerator, with long ribbons and 4 woofers open firing both front/rear. They were inefficient as hellll and I was feeding them 1500 watts each with Carver PM 1.5's bridged mono. The sound stage was fantastic, transparent, and simply stellar

The Classic and Original Carver Amazing Loud Speakers.

https://www.audioresurgence.com/2014/05/gilmore-audio-and-carver-amazing-speakers.html

My Sony amp has an 'on (tv) screen menu' to make nearly all the settings. Easy to find and work with.

Today, I was reading some of the paper manual that came with it and it mentioned there is also a set-up menu on the amp's front panel display. I had never looked at that part of the manual because the amp replaced another Sony amp that was identical except the old one was 7.1...this one is 5.1

Anyway, everything on the amp menu looked good until I came to 'speaker pattern'.
8 diff choices from 2.0 to 5.1......my setting was at 5.0 :eek: (prob factory setting)

Switched it to 5.1 and there was an immediate sound difference (for the good)

I should have read that section in the manual when I first set it up.....live and learn. :)

Read your post #83 where you say all 5.1 are working, lol. I really don't like AV receivers for that reason, lots of crap going on in the background. Good that you discovered it.

^^^ They were all putting out sound....but it wasn't divvied out correctly by the amp.
Yeah..the layers of menu controls and adjustments give me a headache!
I didn't carefully go thru all the settings.:)

It's like reading the whole owners manual of a car...maybe worse. :D