A microstructured optical fiber is structured with a core region and a cladding region surrounding the core region. The structure may be placed in a non-extended position when not being used for such power transfer. A distance from a center of rotation of an inscribed circle contacting the inner circumferential surface of the flexible drum to one random point on the inner circumferential surface of the flexible drum is greater than a distance from the center of rotation of the inscribed circle to another point on the inscribed circle such that the drum maintains a non-circular cross section. Additional apparatuses and methods are disclosed. In said embodiment, a bend or elbow is formed between a first fin component of angular fin and base member proximate the point of attachment at second edge of base member. The overall thickness of the printed circuit board assembly can be minimized to meet the trend of compact design of electronic products.