Starrett 

01381-0 Screw ONLY for Old Style 29 Scratch Gage

This tool is extremely useful for scribing lines parallel to a given surface.
*will not fit new 29B model.
*pic of tool is for reference only

We are an old hardware store with lots of rare & vintage items - in Starrett, Brown & Sharpe, Mitutoyo and many other brands.  Please inquire!
PLEASE NOTE: WE ARE CLOSED ON SATURDAYS & SUNDAYS AND THEREFORE MAY NOT ALWAYS RESPOND TO OFFERS.