Quoted from brainmegaphone:It was a long time ago so I’m not entirely sure but I think it may have been stuck to the bottom with double sided tape?
I’m not familiar with Twister but the link you have to the membrane switch is the same one I bought about a year ago to replace in my Stern Striker Xtreme. I just peeled off the plastic backing and it was self adhesive. I had to replace the old one as it was bubbling up and the last 2 locks wouldn’t register. I had tried glueing down the old one but had no luck. This new one has worked flawlessly for almost a year.