Abstract: A cartridge assembly includes a hub portion having a first end and a second end, a first retaining ring portion including a first snap ring and a first retaining ring member, and a second retaining ring portion including a second snap ring and a second retaining ring member. The cartridge assembly further includes a plurality of disc elements positioned between the first retaining ring portion and the second retaining ring portion, where the plurality of disc elements has an outer diameter that is greater than an outer diameter of the first retaining ring portion and the second retaining ring portion, and a plurality of fastening members positioned at the first end and the second end of the hub portion, the plurality of fastening members extending radially inward from the hub portion.

Abstract: A portable electronic device includes a device body containing a plurality of device structures, one of which is a display module. A cover glass is disposed at an opening of the device body such that at least one of the plurality of device structures underlies the cover glass. An energy absorbing interlayer is disposed between the cover glass and the at least one underlying device structure, where the energy absorbing interlayer has a stiffness that is lower than that of the cover glass.