22 the retaining ring 38 material is selected so that pressure from the thumb may be capable of sufficiently deflecting the retaining ring 38 to lodge the retaining ring 38 into the groove 40 of the cylindrical recess 36 when the retaining ring 38 is disposed within the groove 40 as shown in fig5 the retaining ring 38 protrudes inward and blocks the inner bearing 28 from vibrating out of the cylindrical recess 36 during operation the opposed distal end portions do not protrude inward as in prior art retaining rings in this manner the sanding pad 12 does not contact the retaining ring 38 or any other part to prevent or hamper rotation of the sanding pad 12 during operation to remove the retaining ring 38 from the groove 40 the chuck 22 has a notch 46 that extends at least partially into the groove 40 when the retaining ring 38 is disposed within the grooves 40 the notch 46 provides space so that a screwdriver 48 may be inserted into the notch 46 to push in the retaining ring 38 in the direction of arrow 50 to dislodge the retaining ring 38 out of the groove 40 as shown in fig7 the retaining ring 38 is removed from the chuck 22 to fix or maintain the orbital sander 10 or the internal parts of the chuck 22 the sanding pad 12 includes a sanding disk 52 and sanding bit 54 the sanding bit 54 and the sanding.