The Mellotron Group

What kind of glue is recommended to attach the felt pads on the keyboard? 

I just did an inpection of my keys to determine my plan of attack for cleaning it up, and noticed the all the little white pieces (at least the ones remaining) undernieth the screws are only being held on by the pressure of the screws contacting them. I assume I would use the same glue on the fatter black felts that press down against the tapes. They're all intact on the tape contact side, but I'm missing a few on the opposite side that contacts the bar.

Thanks!