If you wish, you can acquire an even larger diameter of pad against the tonehole if you create a stepped back which allows the larger diameter pad to fit in the cup.
The JLS Cork Pad Spinners are also used to shape the tonehole facing side of the pad so that you can get the venting and reduced turbulence as you wish. Beveling or radiusing the face is often used on clarinet register pads as example.
Select the pad and mount the corresponding size Pad Spinner in your bench motor. Gently insert the pad straight into the cup on the end of the Pad Spinner. The Spinner should hold the pad securely.
Under power, you may sand (try 400 grit) or file (try a #4 cut) a bevel or radius on the exposed edge of the pad.
There is a through hole for pushing the pad out (rather than pulling it with fingernails) using a stick of your choosing. It’s good to have a dedicated stick with a blunt tip so it leaves no mark on the pad surface.
JLS Cork Pad Spinners are designed for pads 2.8mm (.110”) thick.
Tip: Given the imprecise nature of many bench motor chucks, we recommend finding the “sweet spot” where the Spinner runs true and marking it for next time. Perhaps make a permanent mark on the bench motor chuck and then mark the Spinner correspondingly after finding the place where it runs truest. This is a great approach for many tools used in the bench motor.