Levallois point using the debordant method starting with a pre-struck preferential Levallois core

In this video I make a Levallois point from a pre-struck Levallois preferential core. I strike two eclat debordants from the edges of the core to create the guiding Y-shaped ridges, then facet a chapeau de gendarme, then strike off the point which requires no retouch. Sorry the audio is not good - I had the iPhone sitting in a box.