Holes and Stamps
G.T. G?¶rtz states categorically that the threaded holes were to extract the grips from the mold - and not for the grip screws. He states that they were neither meant nor suited for that purpose. There is no substantiation in the form of directives or orders that grip screws were to be kept in the threaded holes. On the contrary, disassembly in the field was not permitted.
The first and best known supplier of plastic grips was H. R?¶mmler AG in Spremberg whose code was â??32â? ; the abbreviation â??HRSâ? was also used as a stamp. Plastic grips
stamped â??MPDâ? were approved by the Staatliche Materialpr?¼fungsamt Berlin-Dahlem (State Material Testing Facility) and a â??Tâ? denoted the type of phenol resin used. Code â??8964â? denoted a resin content of 90% and â??64â? denoted a marble pattern in the material.
As plastic material was first used in large scale production during WWII, methods and materials changed during development. Towards the end of the War, most raw materials were scarce and had to be substituted. Other suppliers did not use these stamps and the materials they used were not tested. This is all I could find -Patrick
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