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i did this over the weekend - took a lot of filing of the hub but couldn't get the standard circlip on.
ended up filing the circlip too and that did the trick - although it's meant i took too much off the circlip so theres a bit of play in the casette.
needs to fix this - but so far the shifting works pretty well with a 3 speed sturmey archer shifter.
for ref - my frame (2009) takes an 18t
terlg
Im using x3 sprockets from an 11-spd cassette (17t, 15t and 13t).
I'm using a stock plastic spacer between the 17t and 15t, and the 13t has a built-in spacer (shoulder) on it. The combination of all 3 cogs doesn't allow sufficient space for the standard width Brompton circlip/snap ring.
I have carefully filed back the width of the tangs on the free hub (see picture for what I'm referring to) which was suggested in the video linked to above, but there still isn't enough space to fit the circlip and I'm reluctant to file away any more.