Stop in for a cup of coffee
Here ya go Mike fill the plug with j b push it in the hole and screw down the mirror.
The kit is 10 bucks on Amazon
Tnisesm 135Pcs 8 Sizes Nylon Plastic Hole Plugs Black 1/4" 5/16" 3/8" 1/2" 5/8" 3/4" 7/8" 1" Round Drill Hole, Furniture Cabinet Insert End Caps Industrial Hardware Biscuits & Plugs​
Here ya go Mike fill the plug with j b push it in the hole and screw down the mirror.
The kit is 10 bucks on Amazon