Originally Posted by
Todd Helme
A 5 inch backing plate on a 6.5 inch pad offers the largest margin of safety for the new polisher. You do loose some efficiency, but it is important to remember that many people have used this set up with great success in the last.
A 6 inch backing plate on a 6.5 inch pad is going to be more efficient (you will, as a by-product, notice the pad will rotate faster as well).
If you have 6.5 inch pads and already have a 6 inch backing plate, then I would stick with this. You can move to a smaller backing plate if you feel you would benefit from a larger safety margin.
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