Abstract: Recording medium disk-hub combination wherein the hub has a central hole whose periphery is bounded at least partly by three flexure members which circumscribe a cylinder corresponding to a disk drive spindle. The three flexure members are arranged in a triangular configuration, and the parts of such flexure members that circumscribe the cylinder are coplanar, forming a flexure member plane of contact. The axial center line of the recording medium disk is spaced from the flexure member plane of contact by no more than three times the thickness of the disk itself. The combination is preferably designed with the ratio of the coefficient of thermal expansion of the hub to that of the recording medium disk being between 0.7 and 1.4. Hub is made magnetic, e.g., by attaching a magnetizable disk. The combination is especially useful for removable recording disks intended to cooperate with disk drives having circular motor spindles and magnetic hold down.

Abstract: An ear lobe piercing device for piercing an ear lobe with a stud, said device having means for holding an ear lobe to numb same prior to insertion of a stud into the lobe, said device further having a plunger for holding the stud, a trigger for both actuating said means for holding the ear lobe and cocking said plunger and trigger means operable by an index finger for releasing the plunger after said plunger has been cocked.