I haven't used my DeWalt DW421 sander for a long time and when I went to use it on a project the pad mounting disc was bad and just fell apart. So I decided to try this one as a replacement. The hardest part of the installation was removing the screws that held the old (original) drive in place. It was a little fiddly getting the screw heads through the holes in the new pad, but a little pressure forced them into the holes and then the only problem was threading them back into the drive plate. The standard pads fit and hold up well. I managed to successfully complete my grinding project.
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