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I believe that is correct about the loctite. Try Getting the tip of a screwdriver red hot and sitting it on the screw and letting the heat transfer for 45 seconds to a minute then try to loosen it again.
The best thing I can recommend is removing the light assembly over the mirror this way you can disconnect the wire to the mirror and remove it still on the glass this makes it easier to work with when the glass is removed no matter what use a # 3 phillips head heated the brass screw does not strip as easily one thing for sure they can be a ***** If all fails the screws can be drilled out and a new one can be used !!!
would not recommend disconnecting from wiring, try a inpact driver, and if all else fails remove bracket with mirror attached and remove bracket on new w/s. tricky but can be done. weird part about screw is the tread does not go all the way to top if you replace from hardware store make sure you strip treads about 1/4" at top.