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@RgrahamH
I had thought that I had a Lytaloy BB axle and asked @7ven to post a picture of his to see if mine matched. From the picture he posted, although mine was hollow like his the way the hole was drilled didn't look the same.
I had been reluctant to strip down the BB, as I am constantly using the bike, but felt I needed to to find out what the BB axle was (the BB cups had no markings).
It turns out my BB axle is a Bayliss Wiley No. 15. I looked in the 1952 Brown Brothers catalogue and found a matching hollow BB axle although this was marked 15R (racing?). I have found mention here that Bayliss & Wiley introduced a hollow BB axle in 1953 but it is described with the name featherweight. So I'm not sure exactly what I have, although I have a feeling it might be a later version than 1953, looking at the stamping.
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