Tom,
Both the EK2 and RK are L/12 mm, but knowing where your interests lie, here are a few more pics of the RK. (Lighting conditions here at the moment are poor)
This is why I included a side-on shot of it - I have been meaning to ask if this was an intended feature done deliberately at assembly by the craftsmen, to make it 'lie' better, or wheather it is purely as a result of wear.
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