Power Cord, Plug Insert, Crimping Machine manufacturer / supplier in China, offering British Type Plug Inserts Ma015-3, Unearthed British Type Plug Inserts Ma015-1j, RV Cord 30A (LA050A) and so on.
It is the last photo.
You have seen all photos.
How to crimp the plug inserts with hollow pins,see the drawing details.
Just crimp on the flat part at the end of hollow pins.