[Hammarlund] Some Speaker Help

[Bill]

Some Speaker Help
 
I have a Hallicrafters pm-23 speaker. In removing the speaker from 
the cabinet, I noticed that the speaker cone is not attached to the metal
speaker frame. 
Is this normal, or should the perimeter of the speaker cone be
glued/attached to the speaker 
frame ?  If it is supposed to be attached, would is the best way to do so ?
 
Thanks
Bill, Ve3jhu
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