The same thing happened to me and my mechanic opted for... silicone jelly instead of
a replacement (which i am quite certain is necessary otherwise and perpostourously expensive because its the whole unit... not just some attatchment piece)
plus silicone jelly is pretty elastic so it will turn if needed (but only when it's really needed)
i mean it is glue... but it has worked phenomenally
Better Answer--correct the root cause.
The pedestal is loose because the "press-nutwasher" has come off. There are 2 parts to the mirror assy. The base(bottom section) and the mirror housing. Those 2 pcs are held together by the press nut which grips the post protruding up from the base unit.
The entire assy must be removed from the door .This means the inside door panel is removed first. The (3) 10mm nuts that hold the mirror assy to the door are accessed thru the 2 rubber ports using an extension ratchet.
The wiring harness has 2 clips to disconnect ;then pull the harness from the car carefully with the mirror assy.
The mirror itself is attached to its plastic ABS frame using silicne rubber and the 2 can be separated carefully to gain access to inside of mirror housing. The mirror is curved and expensive so careful.
I cut all 8 color coded wires--no need to cut the 2 black heater wires -they have slide clips. Do not worry--these wire are reattached using inexpensive insulated crimp type butt connectors--keeping faith with the color codes.
Now you can see the post /spring/press nut assembly which need to be reassembled.
If anyone is out there I'll email a pic of the jig I made to press the nut back on the post.
We could also talk it thru--email me first tcordier@peak.org