An improved handheld electronic device includes a case having an asymmetry provided by an outwardly protruding corner. In an illustrative implementation, the data communications architecture communicates data across communications links. The removal of at least a portion of the slack includes changing the position of a servo motor relative to a flexible tube termination block until a specified tension is encountered in at least one of the control cables. A UuRB which is to be mapped to the selected UnRB is set up between the relay node and the user equipment. The present invention is a polymerizable composition, which comprises a polymerizable substance containing a norbornene-based monomer or oligomer as a main component, a metathesis polymerization catalyst and silica powder, the weight content of the silica powder being larger than the weight content of the polymerizable substance. In one embodiment, the apparatus and related methods involve affixing the strings from an existing guitar to an improved pitch-changing mechanism, such as disclosed string pitch changer housing, that does not require the deconstruction of the guitar body.