Heckert (WMW) FW315, FU315, FW400, FW400V and FSS400 x 1600 Millers. Installation and Operator's Instruction Manual with Sectional Drawings. This edition is for the older models with logic controllers. The Instructions relating directly to the FSS-400 were contained in s Supplementary Publication and cover the basic Installation, Instruction Maintenance Manual with a number of useful Sectional Drawings including Spindle Brake, Vertical Head, clutches, anti-backlash nut, gearing layout, etc.