Watch the silent birth of one of the world’s loudest acoustic instruments. In Bobby Johnston’s famous workshop, a 10-day process happens in 9 minutes using the 'here’s one I made earlier' trick. Hair and fat is scrapped from the goat skin until it is as smooth as plastic. The skins are soaked before the final residue is removed and they are fastened onto the flesh hoops with glue. The drum skins are inspected for flaws, then a band of wood is clamped into a wooden frame to shape the drum. Finally, Mr Johnston adjusts the ropes until both sides of the drum sound the same.