A sealed bearing includes a first race having a circumferential outer surface with a first portion of a first diameter and a second portion of a reduced diameter. The apparatus includes a member which is sized to penetrate into at least the dermal layer of skin to collect a sample of body fluid located within the dermal layer. Each fractional actuator can be continuously throttled to reduce the speed or torque at which the actuator operates. A first metallization layer closest to the through-substrate via is larger than one or more overlying metallization layers. The adhesive is disposed between the two bodies, thereby coupling the bodies together. The method includes emitting light waves from at least one light source, to a back surface of each display in a plurality of displays, thereby back-lighting the plurality of displays.