Resonator has come loose on the Mic

So my SM57 had lost some gain so I opened up the microphone to see if I could fix it, of course, I just made it worse and the resonator came off the top of the mic and the adhesive seems to be dry so I cant stick it back on. I also tried just holding the loose part back onto where it should be but i couldn’t get any sound from it.

I know I might of just totally written off the mic but just wanted to see if anyone knew if it was a fixable issue, any help would be appreciated.

I have attached some images for reference.

Thanks!