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NOTE: I have done the Kevin Brown washer mod on the MKII.
However...

They did CHANGE the shape of the area where the KB washer goes on the MKII.
(My guess is Rupes didn't appreciate KB's 5 cent...

I have a Rupes LHR 21ES Big Foot Random Orbital Polisher (original model) and a Rupes BigFoot LHR15 MarkII Random Orbital Polisher.
I have a 5" backing plate on both machines. I have been using the...