Moen Chateau trying to replace cartridge Phillips screw that holds parts to cartridge just turns, Stripped? how do I get that our

There is what I will call a rubber/plastic grommet between
the top screw and the top of the cartridge.
The screw compresses the grommet and keeps the handle up .
(the grommet has two parts.. tightening the screw closes the
space between the grommet parts)
In my case.. the grommet had a crack .... preventing the grommet
from doing its job of holding the handle up.
Fortunately, Moen will replace the innards.

workaround.. .place a rubber washer between the screw and the grommet.
worked for me ... after some pain and suffering..