The wappen is mostly attached to the helmet with lugs or screws, to be able to remove it safely for cleaning,
With split pins, you can only remove it so many times before the pins will break off.
Ed, the metal on the officer Wappen would have been Mercury Gilded and did not require cleaning per se. With my luck split pins could only be bent one time and that could really be dangerous. Brian had
some sort of technique where you heated up the prongs but I had visions of blowtorches on a helmet with Brian as the mad scientist. I am sure that people like Cameron know what to do to get those on and off but I just will not risk it. I think Peter is on the right track… Finding the right photograph… Cruciform base??