If you talked to Kevin I would also inquire about the custom cut backing plate for the MF pads. I got one last week from Kevin and let me just say I was blown away how much smoother and faster the correction work was. I have 2-21 Bigfoots and I use the custom BP for my MF pads,and then use the other 21 with a 5 inch backing plate for my lake country foam and my Rupes 6 inch foam for polishing.