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Save yourself a world of pain and take it somewhere decent for a service.
Is it that bad?
Surely the wheel is just unhooking the 3 speed and some wheel nuts. At which point it's a re-cable and gear adjustment.
Or am I missing something?
It's my dad's so, I guess I can just tell him to take it somewhere.
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Is it that bad?
Not really, just that it's quite a complicated service and a shop that have mechanic trained to work on Brompton mean that they can assess your bike properly and quote what need replacing/looking at.
Before you recabled it, the housing may also need replacing, so I would recommend getting Brompton's own cableset for it.
Save yourself a world of pain and take it somewhere decent for a service.