Includes a custom fit 1/4"-20 UNC bolt with handle.(standard camera thread)It is tappered to make inserting it into a proper thread-cutter easier.You MAY try using a 1/4-20 nut instead but this hasn't been tested.(I'm using the proper tools for the proper job.)The 200pl_GH2.* files are a special version of the adapter plate that allows the battery door of the Panasonic GH1 and GH2 cameras to still open.You can change the parameters to make a 3/8-16 UNC bolt instead.You can also chane the depth of the nut on your camera. The default is 7mm (works on all of mine).The plate is already exported for 1/2-20 UNC and 3/8-16 UNC.You can find a spring loaded quick release adaptor for these here:https://www.youmagine.com/designs/spring-loaded-quick-release