While I've never disassembled the mirror I was afforded the opportunity to replace it thanks to the RV that parked beside my at the storage log...
FYI
https://www.pacificrvmirrors.com/product-p/719216.htm is the passenger side mirror for the 2018 Vegas.
While installing the new mirror it looked like you could get to the screws to disassemble it through the mounting post hole.
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