Procinematools.com throws up a short video review showing the Edelkrone Monitor / EVF Holder. These types of brackets are great when you need to readjust the position of your monitor or EVF through the day and they don't tend to spin loose like traditional friction arms. The Edelkrone Monitor / EVF Holder can be found at https://Edelkrone.com and often cheaper through eBay (found here).

Edelkrone Monitor / EVF Holder