Drill, Backer Pad, and Interface Pads are covered under my “Blue Flex Sanding Disks” blog entry. See http://carlford.info/blog/2014/11/blue-flex-sanding-disks/
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Meta Description: Carl recommends a Drill, Backer Pads, and Interface Pads for power sanding. See his “Blue Flex Sanding Disks” blog entry.