Right hand shifter not shifting

[Kell]

I have a 2015 6-speed Brompton.

Last week, I was struggling to get it to shift to the higher gears (5/6) as the shifter felt like it was stuck on something. Would go after several attempts, but sometimes I needed to flick it the other way first and then it went.

Unfortunately, I was away all last weekend and will be away all this weekend, so time is limited.

But I do need to give it a look at as there were several times this morning when I couldn't get it to shift at all. Given that 4th and 5th are my two most used gears, it's problematic.

In order to save time diagnosing, does anyone have any idea what could be causing this? i.e. which end should I start looking at? D Othey shifters wear out? Is the chain at the other end end likely to catching on something?

TIA

 

[T4tomo]

disconnect cable and see if derailleur & shifter both move freely by hand

if they are both fine then renew your cable inner and outer.

if they aren't fine then your into blasting with GT85 and praying!

 

[T4tomo]

oh hang on this a brompton innit.
could still be a sticky cable issue
SA or SRAM hub?

 

[Kell]

It's the BWR hub so SA I think.

 

[Kell]

SO I had a look last night and I think the shifter's knackered.

The little nut at the back has somehow shaken loose (and fallen out) so it's not all sitting together properly and holding everything together properly. by holding it all together with my hand, I can get it to shift so I could just try and source another nut, but I've gone ahead and ordered another shifter.

Though I did think after that, should I have used it as a change to upgrade the shifters? Do the new one work with the old gears?

 

[cyberknight]

is this the right part ? might be worth contacting brompton direct
https://www.brompton.com/p/1073/brompton-hub-gear-right-hand-shifter-pre17