Thanks Dave and Spook for the support.

The gray clips are OK, its the white studs that are screwed in from above,
apparently before the head liner is installed. They came loose.
I don't plan to mess with the head liner.
There is a single barbed button in the center by the hole for the rear light.
It holds everything pretty good.
This critter has a screw head in it but you need to pry it out with a thin screwdriver, putty knife or trim tool.
It goes in hard as well, start it with one barb and smash it home with the ass end of a screwdriver.
Maybe the white studs can be epoxied back onto the short coarse thread screws,
if not then Dave's idea of duck seal is plan B.



I'll take another look with a mirror for that check valve by the right rear taillight.
Before attempting to fish around I'll get a tetanus booster,
I've got big hands that don't fit in that hole without leaving skin and blood.

I have a new 850 washer check valve (3 ports) #81432074
Maybe I can seal one port and use it? Epoxy a cut off nail in one hole should work.

Cheers, Bill

Abstinence makes the heart grow fonder