Methods and systems for marring the surface of a fiber optic substrate by
pressing a length of the substrate against an elongate support with at least one
roller and causing relative lengthwise movement between the roller and support
with the roller pressing the substrate against the support and the roller rolling
along the substrate. One of the roller and support may have an abrasive surface
for marring the substrate during such relative lengthwise movement between the
roller and support. Alternatively, the abrasive surface may be on a sheet supported
by the support.
