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Do not be surprised that in time that it fails in the same spot also due to the casting may taper down thin in the area of pinching contact and can wear or get distorted it the mirror is bumped.
Then you will right back to square one and may need to use thin washers like I have had to do to tighten it up.
I use 3M's black strip caulk to hold it in place while I slide the mirror onto the base. It has worked for me that way countless times. and I have a serious selection of thin stainless steel washers that I can choose from to get the correct thickness.
Thanks so much will glue the washers, this appears to be the only solution.
Should the rubber gasket sit under the lip of the well nut rubber? I put the well nut inserts in the door, then pulled the rubber circle up and over the mirror gasket. If I tried to put this gasket directly on top of the well nut inserts it sat too high.
Hard to believe both mirrors they send me were flawed, must be the way they make these reproductions.
I never liked those rubber compression well nuts. I use the collapsible drywall molly anchors to mount the base to the door. Never a wobble from a rubber mount again. Rock solid.
The mirror base is supposed to have a vinyl gasket/shim so that it doesn't rub directly on the paint. If you did not receive that gasket, you need one. It has the thickness required and also have a raised bead which fits snugly to the outer perimeter of the mirror base, keeping water & debris out.