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@jeff80
The bottom bracket axle will be a Chater Lea 1240 for oversize bottom bracket. (all Carlton's seem to have come with these early on). The only problem I envisage is that the simplex rear derailleur is for 1/8th chain, while the chatter lea adaptor is for 3/32 chainrings, so hopefully there will be enough physical space between these for the chain to move between without snagging or getting jammed. As the mechanism of a manual changer is pretty crude, I'm hoping it will be ok or can be botched if needs be (something that seems to have happened a lot back in the day....)
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