Reduce the arbor hole size on a sanding flap wheel so that it fits the shaft on your tool. These reducers come in pairs. To install, snap a reducer into the arbor hole on both sides of the sanding wheel.
Flap Sanding Sleeve Drums for Handheld Power Tools
Slide a flap sanding sleeve on the drum and twist the drum by hand to secure the sleeve. The shank on these drums installs directly into the collet of a grinder or the chuck on a hand-held drill. A drum is required to use a sanding sleeve.