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The current Brompton shifters are absolute dogshit. I’ve found that you can open them up and re-tension the spring to a degree, but they’re so badly designed that there is loads of friction and they jam up. Me pet hate is that when you pull the cable out the little white plastic doodah that hold the nipple in place either pops out or rotates and you can’t get a new cable in without opening it up. They’re useless. Just buy a new one or an aftermarket.
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The only specialist tool you need is a large ring spanner to remove the plastic lock ring. Remove this, and the NDS lock nut and cone, the the whole internal body can be removed from the shell. A good clean of the internals and the inside of the shell, followed by a thorough lubing of the internals by an oil bath, is all it needs.
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The best way is to service it regularly. This mostly involves removing the internals and bathing them in the specific Shimano oil bath. In London I’d say do this at least yearly.
The real issue is with the main bearing on the drive side. The bearing race is built into the ring body and isn’t replaceable, and it this which seems to wear out and gets pitted. It’ll still work but it’ll sound like shite.
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That's great. What was the Gaga thing about tho?