Abstract: A housing has a bud portion abutting an elongated stem portion. The bud portion is to fit within an ear. The bud portion has a primary sound outlet at its far end that is to be inserted into an outer ear canal, and abuts the stem portion at its near end. A speaker driver is inside the bud portion. Electronic circuitry inside the housing includes a wireless communications interface to receive audio content over-the-air and in response provides an audio signal to the speaker driver. A rechargeable battery as a power source for the electronic circuitry is located inside a cavity of the stem portion. Other embodiments are also described and claimed.

Abstract: An apparatus for adjusting the backlash on a differential has a clamp for holding the pinion gears to the housing, locating means for precisely positioning the housing and bevel gear relative to one another, an air cylinder to press the bevel gears towards the pinion gear, and a micrometer used to measure the travel distance of the bevel gear. The clamp preferably also includes tangs resiliently pressing the bevel gear away from the pinion gears, both to aid in separating the bevel gear from the pinion gears and to compress any clutch pack in the differential, e.g., if it is a limited slip differential.

Abstract: A tool is provided for adjusting the bearing pre-load and backlash of a differential. The tool has a U-shaped positioning member with an adjustable width base. Bi-directional ratchet heads are provided on the ends of the U, with tools thereon for engaging the side quills of the differential. Setting the ratchets to operate in opposite directions allows easy adjustment of the relative distance between the side quills, and consequently adjustment of the pre-load on the bearings for the differential. Setting the ratchets to operate in the same direction maintains a constant distance between the side quills, but shifts them back and forth in the differential housing, allowing easy adjustment of the backlash between the differential ring gear and the drive shaft pinion gear.

Abstract: A method for adjusting the backlash between the pinion gears and the bevel gears of a bevel-type differential is to mount the elements in the corresponding differential housing half, hold the pinion gears against the half and press the bevel gear towards the bevel pinion gears. The travel distance of the bevel gear is measured, and a shim is provided between the bevel gear and the housing having a thickness approximately equal to the difference between the measured displacement and the previously calculated desired displacement. An apparatus for practicing the method has a clamp for holding the pinion gears to the housing, locating means for precisely positioning the housing and bevel gear relative to one another, an air cylinder to press the bevel gears towards the pinion gear, and a micrometer used to measure the travel distance of the bevel gear.