How does the DW4945, or any backing pad, fit on the spindle of the new DEWALT 4 1/2" grinders? Support November 05, 2020 18:54 Updated Follow In order to use a backing pad on this grinder you should remove the inner flange/washer and put the pad onto the spindle. Related articles Why did I get a hex wrench with my new DEWALT Angle Grinder? Do you have a Type 1 guard for the DEWALT® DCG413 grinder? Where can I find replacement wheels for my straight grinder? Where can I find manuals, part lists, and diagrams? Can I order replacement parts from DEWALT? Comments 0 comments Please sign in to leave a comment.