T-35's were produced between 1934 and 1939. late in porduction there was many attempts to fix issues with the tank. this included a newly designed flywheel. the 3D printed idler wheel i am producing is the perfect edition to your model, as it will accuaratly simulate the real thing. i would reccomend that persons wishing to use this item be confident with modelling, as some slight modifacation might be nessesery. also consider researching what tanks used this wheel, as although all maeks of T-35 used this wheel, it was only implimented on several tanks. i have provided 4 photographs of real T-35's of all marks with this wheel.