An Edco Mono Block would can be used to convert them to 11 speed. They are a bit pricy but very light and beatifully made.
I'd genuinely never seen those before. You're right about the price, but they're cool as fuck! Let me think about whether I can also justify dropping £160 on a cassette. In the meantime, GLWS.
@returnofthestaff started
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An Edco Mono Block would can be used to convert them to 11 speed. They are a bit pricy but very light and beatifully made.