Best way to replace key cups

I’ve taken off some keys on my laptop to see which style keys my laptop has so that I can purchase replacements for worn-out keys. After noticing how dirty one was, I took off some more to clean. In doing this, one of the rubber cups making the contact and triggering the keypress was loose and came off. I was able to refit all keys successfully except the key in question. I used some super glue around the rubber cup of the key, put the cup in place and let the glue dry for a moment. I then replaced the key just as I did for the rest, except this key no longer functions when being pressed.

I’ve removed this key again and cleaned the glue as best as possible. I put the cup in place again and tested if it would trigger the keypress and it would not.

what can be done to fix this key?