The coil spring assemblies are designed for medium pressure applications in blanking, piercing and forming dies-plus many other uses. Simply, drill and tap 3/8" - 24 location holes for each assembly. (1/4" - 20 tap for catalog A-I 50). The assemblies can be used with or without a stripper plate if the design is suitable. A 3/8" - 24 x 3/4" LG. FLAT HEAD SCREW WITH LOCK WASHER IS FURNISHED FOR RETAINING A 1/4" THICK STRIPPERPLATE. (1/4" - 20 X 112" SCREW FOR CAT. A-150 ONLY.) 
CLARK & OSBORNE
If a stripper plate is used, caution must be used to make sure the screw does not enter the travel area as shown in the above drawing. Cap screws may be used for holding the stripper plate, however, this would require a much thicker plate to accommodate the thicker head on the screw. Some users save additional time and money by only attaching a portion of the assemblies to the stripper plate, provided the design is suitable.