Okay, I ordered 2 Rubik's brand DIY and the center pieces pop like crazy! Is there a way I can prevent this but still be able to adjust the screws? Its kind of annoying.
I use hot glue, although it does not make it very easy to access the screws and it must be glued carefully to get it to hold. Just make sure you have the screws where you want them for now. You could also try tape which probably works well.
Just apply a really small drop of it on the inside edge of the cubie center and push in the cap.
You can remove the cap by using a thin object, e.g. screwdriver, by snapping the cap off. You've to be careful not to damage the center piece when doing htis.