Jimmy Reno was also an inventive chap and had a factory in Altrincham which produced these unique drums in the late 1940s/early 1950s. Reno shells were extremely thin - made, according to Bob Henrit, from post-war RAF surplus plywood. But it is the internal tensioning mechanism which is remarkable and - again according to Bob - Reno applied for a patent as far back as 1939.
Historically, there have been several attempts to devise a single tuning mechanism, from Leedy and Ludwig’s Knob Tension to Arbiter’s AT, but ultimately they have all been spurned by drummers. Reno’s Pressure Ring design had the calf skins pushed upwards from inside, the reverse of normal drums where the skins are pulled downwards.