Enigma ring settings - is the relative location of the turnover all that matters?
Mechanically the only effect of the Ringstellung is to determine the rollover points as you surmise. This is easily inferred from descriptions of Enigma models in Alan Turing &quot;Prof's Book where &quot;comic strip&quot; and paper Engimas only use the Ringstellung information to determine rollovers.
Cryptanalytically the effect is that if the message indicator or &quot;window position&quot; of the machine is known but the Ringstellug is not, then nothing is revealed about the &quot;wheel position&quot; or &quot;rod position&quot; as it was referred to at Bletchley Park. There were instances when such information was known, but it was not always easy to bring to bear on the cryptanalysis. A notable exception was the Herivelismus exploitation of human error that noted that common message indicators were often correlated with Ringstellung settings. This was a very useful step in separating out one part of Enigma settings and solving for it separately early on in the war.