The 18" tube type wheels on my 1959 3800 1-ton had those wheels, and they are VERY susceptible to rust damage. If you look closely, there are two slightly relieved areas at about the 10:00 and 2:00 position on the lock ring which allows the ring to be lifted slightly at the top and gently tapped off the main wheel assembly. The locking area is so small that even a little rust or wear makes them dangerous to inflate. Do a thorough cleaning of both the ring and the groove in the wheel with a wire brush and inspect very carefully for erosion of the mating surfaces. DO NOT paint the mating surfaces of the wheel or the ring. If you want a good-looking assembly, do your painting after the wheel is assembled and the tire is inflated.
Jerry
