In the summer of 1938 a further problem for the Renault design materialised in that a new demand was made that the turret should hold a stabilised gun and a telemetric rangefinder, features to which the cast turret could not be easily adapted. As the 2.5 tonne pseudo-turret was moved about by the gun barrel, its momentum tended to disturb the sight-laying. This problem was solved in 1939 with the help of APX, which designed a system in which the vertical axis of the gun mount was directly connected to the turret roof. At the same time the troublesome Cleveland transmission was abandoned. Overall the Renault design process in the years 1938 and 1939 was very slow.