The edge adapter with 4" pads works great but there are still some places that the PC gets into better . Even when I use one of my rotaries I still use the PC to get into tight areas. But is all relevant to the Vehicle that you are working on. Plus recently I have been using the new Lake Country Hydro pads so I'm using the Flex standard backing plate for the 6.5 " pads and the PC XP with the 4 " ones.
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