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Thanks very much for that, I think I'll have a go at chamfering the 12T sprocket (I've given up trying to use an 11T one for the reasons you outlined above), as I have some dremel tools that should work OK. But I also thought I'd have a go at milling the side of the circlip (using an angle grinder), making it slightly towards a D in cross-section. But should I install it on the wheel with the flat section facing outwards, or inwards towards the 12T sprocket - or does it not matter which way it goes in?
Thanks in advance.
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The conversion is proceeding OK so far, though I'm a little concerned about retaining the sprockets. You mentioned earlier (#12) that you'd had problems with the garden wire retention method. I've tried various things but that's the only one that works so far, but I'm naturally concerned about its longevity. Was it difficult to file away enough of the smallest sprocket to fit the Brompton circlip? And what tool did you use for this?
Another question: somewhere you mentioned that you'd had to fit a home-made washer on the outside to enable the shifter to move further out. I've been wondering whether it would be possible to file away partially at the wings of the chain pusher wing plate to extend the shifting range. Do you think that would work?
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I'm now actively exploring this idea and will be happy to share ideas and progress, but have one question at this stage: presumably a switch to a 9- or 10-speed chain is necessary? I ask because I accidentally tried to put a 9-speed chain on my B at an earlier point, and the Brompton shifter mechanism didn't like it. It sulked and refused to change sprockets. Anyone have any thoughts on this?
PS: My previous post on this shows up as from a guest, user89861. But I've now signed up to the site properly.
I'm a Brompronaut, a Moultoneer and whatever you call someone who rides a Birdy and a Pashley Sovereign Princess (my wife suggests the technical term "nutter").