German liner installation
"How do I install
a liner in a German helmet?"
German Steel Helmets M35, M40 and M42:
Find the rear seam on the liner band (the metal part). There will be a hole... place the liner in the shell and line this hole up with the rear hole in the shell. Install the first split pin (legs should spread out up-down); you'll have to wrestle with the inner leather band a bit, holding it out while you spread the split pin.