A method and apparatus for mounting auxiliary eyeglasses on conventional eyeglasses in which magnets are attached to temple extensions or temples on the conventional eyeglasses to mate with magnets mounted in appendages of the auxiliary eyeglasses. When a message is received by an inbound message server, a message source is determined for the message. A rigidifying steel member co-extensive in length with the trough is welded to it, and is also welded to the outer side of the tank. The joining means, when coupled, causes the two drive wheels to rotate in unison preventing the wheelchair from veering-off so that it travels straight when traversing a sloped surface, and when uncoupled allowing the two drive wheels to rotate at different speeds to allow turning. The belt drive system may be used for transferring or shuttling a plurality of tool trays laterally with respect to a working station at a conveyor assembly line and storage stations on opposite sides of the working station. In this configuration, position control responsive to displacement of the electronic component by the self alignment effect exerted by the molten solder paste is fulfilled.