I just finished scratch building "board by board" a double-board roof using the latest version of Northwest Shortline's "Chopper" and it is so much better than the original. The new version has an easily replaceable rubber mat which is important since it will eventually become scored by the blade. Just as significant to me the blade of the single razorblade is held much more rigidly, resulting in a cut that much more square on the end.
I mention all of this as NWSL is up for sale and as we are learning, things change when this happens, including things disappearing altogether.
