On the M mirrors there's a small cover on the bottom held on by a couple of screws.
With that cover off, I found it much easier to rotate that locking disc.
...that's funny, I never thought about the type R, but I see what you mean.
It's actually a derivative of occupation (systems integrator)
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'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)
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