I have one of these, and having indexing problems, I'm reminded that there's no rear adjust, although it's much easier to set them up right by watching the alignment of the chain as you set the cable tension. Rummaging in my spares box I found an old adjuster from a front shifter, but it fouls on the mech mounting bracket 🙁 Anyone come across an inline cable adjuster ?

Use the barrel adjuster at the shifter end?

hh +1

Use the barrel adjuster at the shifter end?

well obviously, but not having orang-utanlike arms, it's hard to reach while peering at the chain from behind!

don't look, listen!

Inline adjusters are popular on road bikes – Jagwire do them.
http://www.byercycles.co.uk/32R0908.html