The Romanian industry adapted to maintain complex AFVs after the 1941 campaign, when it managed to repair 50 of its Panzer 35(t) light tanks at Ploiești. More comprehensive repairs were carried out for Romania's Renault R35 tanks. An important upgrade was the fitting of new, metal-rimmed, locally designed wheels which were 10 times as durable as the rubber-rimmed originals. Other parts for this tank were also manufactured by several Romanian factories: drive sprockets were produced at the Reșița Works, the fore-mentioned metal-rimmed road wheels along with new tracks were produced at the Concordia Works in Ploiești, and cylinder heads along with drive shafts were cast at the Basarab Works in Bucharest and finished by IAR at Brașov. For the future rearming of 30 R35s as tank destroyers, new gun mounts containing recoil mechanisms were cast at the Concordia Works and fitted as extension to the R35's turret. Romania's T-60 light tanks, captured from the Soviet Union, were to be rebuilt as tank destroyers. To support the added weight this would entail, new road wheels and stronger torsion bars were cast and finished by the Industria Sirmei at Turda, IAR at Brașov and Concordia at Ploiești. The new superstructure for the would-be tank destroyers was designed and cast at Concordia in Ploiești and finished by the Astra Works in Brașov and Lemaitre Works in Bucharest. Romanian factories also refurbished 34 captured Komsomolets armored tractors in 1943, and in early 1944 these were fitted with hooks which enabled them to tow the German Pak 38 anti-tank gun.