BECAUSE THIS CYLINDER IS HELD FROM BEHIND WITH MACHINE SCREWS, THERE IS NO INTERRUPTION OF THE CYLINDRICAL SURFACE. THIS PROVIDES A SMOOTH, CLEAN WORKING SURFACE. THE TRUNCATED AND THREADED CYLINDER IS OUR MOST WIDELY USED CYLINDRICAL COMPONENT. THE LAND LEFT AROUND THE EDGE OF THE FLAT DUE TO THE RECESS FORMS AN EXTREMELY STABLE MOUNTING SURFACE. THESE HARDENED AND DIMENSIONALLY STABILIZED STAINLESS STEEL CYLINDERS ARE PRECISION GROUND AND MACHINE LAPPED TO PROVIDE EXCELLENT CYLINDRICITY WITH CLOSE DIMENSIONAL TOLERANCE. THE HIGHLY-REGULAR LOW MICROINCH SURFACE TEXTURE GENERATED BY THE MACHINE LAPPING LEADS TO LOW HYSTERESIS AND EXCELLENT REPEATABILITY. TWO PARALLEL MOUNTED CYLINDERS, HELD IN PLACE BY MACHINE SCREWS, FORM A VERY HIGH QUALITY SUBSTITUTE FOR THE HARD TO MANUFACTURE VEE GROOVE. THIS DESIGN HAS A .005" DEEP RECESS ON ITS FLAT SURFACE THAT IS MADE VERY ROUGH BY ELECTRICAL DISCHARGE MACHINING. WHEN MAXIMUM RELIABILITY IS REQUIRED, GLUE MAY BE APPLIED TO THIS ROUGH SURFACE TO FORM A PERMANENT BOND BETWEEN THIS COMPONENT, THE MACHINE SCREW, AND THE MOUNTING SURFACE.