An optical mark recognition tabulation device includes a guide channel
including opposing integral sidewalls configured to laterally constrain a
test sheet as the test sheet is fed past a set of optical sensors. The
optical sensors are aligned with optical entry indicia on the test sheet
to sense marks on the optical entry indicia as the test sheet is fed past
the optical sensors. The optical mark recognition tabulation device
further includes a recessed channel located along at least a substantial
portion of a side of the guide channel. The optical mark recognition
tabulation device further includes a spacer strip configured to be
received within the recessed channel and effectively reduce the width of
the guide channel such that the guide channel is reconfigured to
laterally constrain a different size of test sheet when the spacer strip
is received within the recessed channel.