When your cup wheels need to stay put, use the Runyon Surface Prep Adaptor Nut Set for Grinding Cup Wheels. This long set fits a 7/8″ up to 5/8″ opening for non-threaded cup wheels. In addition, it is available for high and low settings for different depths. Change out your 7/8″ up 5/8″ cup wheels and use only one versatile nut.
Part Number: RSP-LONGANS or RSP-SHORTANS
Available in short or long version.