The wheelchair wheel cover includes a cover hub, radially extending disk and an integral radially outer wall that extends axially from the disk to a cover inboard edge. A top leg, a middle leg and a bottom leg are all coupled to the semiconductor device and each has a lead terminal portion extending beyond the boundary of said molded housing. A top wall and a floor define the reservoir. For example, the contact can have a tubular shape, optionally with an elongated slit, and can be crimped around the lead to apply the generally uniform radial pressure. The process provides an engineered host cell which can be used to express and target any desirable gene involved in glycosylation. The substantially semicylindrical lens is semicircular in cross section along a second direction, and has a lens surface curved in a first direction so that its diameter is larger at both ends in the first direction than in the center in order to serve a function of correcting the shading caused by the optical conditions outside the device.