Hi All, New to this forum and starting off be resurrecting this popular thread. Big thanks to the OP for posting this. I picked up the mirror along with the newer adapter and am having the same issue as the last post. I'm able to get the adapter onto the windshield button fully seated, but the mirror itself seems very loose on the adapter. The screw that came on the base(no extra provided with mine) is very short and does not even make contact anywhere. Also, once the base is seated on the adapter, the screw does not sit over the hole(where the extra plate was originally needed), it actually sits much lower. The base screw(if it was longer) would touch the tightening screw on the adapter?
Hopefully this makes sense to everyone. I've contacted the company I bought it from(via amazon) directly and am waiting to hear back. I may call them today too.