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0.8 according to my feeler gauge.
It was pretty nerve-wracking. I started on the front / left just in case I ballsed it up.
It needs tidying and there is too much free space at the top of the guide, which might be visable in the 2nd pic. The plan is to try and fill it with solder and re-tap.
As cool as it would be to use the springs and have them as fully adjustable barrel adjusters I think a flush fit would be more strong and stable. Then I'd probably trim the length so there's less thread on display.
That's the plan anyway.
Decided to go for 1x9.
There's a nice public trail that we mini-hiked at the weekend which requires going up a big grassy hill. I should just get a couple of smaller cogs to try, but then I need to adjust the chain length and by the time I've fucked about with that... Etc...
Step 1. resolve the issue with the downtube cable guides.
Problem: no ferals known to man nor LBS have fit.
Solution: drill and tap to M5 and use the internals from a barrel adjuster.
... Scary. Let's see if it works.