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I am looking for a sanding/grinding disc, used on my Makita 9005B, it is made of a pvc/plastic/rubber material which allows "play" in grinding/heavy sanding. I have located the inner washer and outer nut #'s 34 and 35 on the parts diagram.
Makita does offer a backing pad part number 743015-1 but you will have to order part number 193048-0 sanding lock nut, to secure the sandpaper to the pad. There is another option, which is part number MG0500 5 inch backing pad, it includes the retaining nut to secure the sandpaper.
I own and use 3 of these grinders on a daily basis for heavy industrial mine welding applications. The best electric grinders I've ever used hands down. Easy to fix and repair in the field aswell. Very natural comfortable grip to use with welding gloves on. Buy one you'll love it!