Speaker dust cap re-glue!

[severinsteel]

Hey guys, so I have a Celestion G12T75 speaker that was acting funny. It was about half it's normal volume and just didn't sound right. So, I removed it from the cab and noticed that the dust cap had partially separated from the cone, about 1/4th of the cone to be exact. The rest of the speaker looks great (as does the cone itself) and it looks like the dust cap just needs to be re-glued on that spot. What kind of glue do I need?
Thanks!

Cam