If we can we tell if they definitely are the 600mm idlers on 007 and if we can determine that small idlers were used only with the steel wheels, then we could conclude that 007 had steel wheels.
Terry
Thank you Terry, that was my point.
Doyle and Jentz do state that the small idlers were introduced to the production line after the steel wheels.
Here is a large idler;
And here is a small idler. The central hub is the same size. The outer rim has been shrunk inwards:
Here is our one and only photo of 007. Fortunately the idlers are visible.
David