Abstract: A tether for a ball; the tether formed from a primary shock cord having a first spring constant and a secondary shock device having a second spring constant. The primary shock cord and differential shock devices may be connected together by way of a swivel in order to enable natural movements of the ball. In order to reduce the possibility of failure of the tether, the different spring constants selected for the primary shock devices and the differential shock device.

Abstract: A drive platform assembly for a personal computer for carrying both floppy disc drives and hard disc drives which facilitates the installation and replacement of such disc drives. The drive platform assembly includes a drive platform and an expansion platform. The drive platform is adapted to carry a 3.5 inch floppy disc drive and two 3.5 inch (1-inch height or a single 1.56-inch height) IDE hard disc drives. A mounting bracket is provided for carrying either a floppy disc drive or a hard disc drive that is rotated into place within the drive platform. Once rotated into place, the mounting bracket is automatically grounded. The mounting bracket is adapted to be secured to the drive platform relatively quickly and easily without the use of fasteners. An expansion platform is provided and adapted to be releasably secured to the drive platform to form the drive platform assembly. The expansion platform is adapted to carry additional floppy or hard disk drives.