The transverse width of the
slot in the hornblock is 0.6mm, and thus will be
suitable for frame or hornguide thicknesses up to 20 thou (0.5mm). Metal
thickness in most etched kit chassis framework is nominally 18 thou
(0.45mm), so these hornblocks are ideally suited. Note the transverse
asymmetry of the hornblock slot, a feature that can be exploited to
control or alleviate wheelset sideplay in critical situations.