Just been watching James May reassemble a 300 type telephone. The really interesting bit for me, as an ex G.P.O. engineer, was the anachronistic use of a "screwplacer", the thing he used to hold screws by the slot in the heads. I was stationed, with four other engineers, in the met office at Bracknell in the mid sixties, maintaining rather a lot of mechanical teleprinters. We were given "screwplacers", to field trial in about 1966. Brilliant tool! I still have mine. We highly recomended them. The G.P.O. called it the Screwplacer Number 1.They were made in America, and labeled "Quick Wedge " made in Salt Lake City. Mr May seemed to actually tighten the screws with his. This is the way to destroy the toll. It was for starting the screws, not to fully tighten.