Meant to say:
At least he seems to know now that you can unscrew the cart screw and carefully swap the PCB into the new case. (not swap PCB's).
Only thing to be careful of is not to overtighten the screw.
And if the original screw does not come out (something stripped--in my case it was the screw, not the case), like, if it spins around forever without coming out, you can simply dab a tiny bit of super glue onto the mini phillips head, then stick the screwdriver in and hold it in place for a few minutes (make sure the super glue doesn't get on the SIDES of the screwdriver or touch the G6 plastic) and then the screw will come right out.
(if you do have a stripped screw, unscrewing another screw from a different case and swapping screws will prove if the screw or plastic was stripped).