An apparatus and method for adding an alkali metal promoter into steam and contacting the solution with a dehydrogenation catalyst during a dehydrogenation reaction is disclosed. The elongate shaft assembly includes at least one primary shaft segment, and at least one secondary shaft segment removably coupled to the primary shaft segment, the secondary shaft segment includes a first gear. The linker units may include an alkane, alkene, phenyl, diphenyl, or benzylic group, among others. The voltage sensor detects a sensed voltage corresponding to a status of a lamp. The information medium may extend to the upper portion of the cover farthest from the base, in which case, the cover may include anti-tipping measures which support the upper edge of the information medium in at least one direction to prevent tipping of the medium. The printed products are deposited on the intermediate element or on previously deposited printed products, wherein a partial stack forms on the intermediate element.