Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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That's a strange looking cable guide, Is the central insert removable?
if so, and the guide isn't threaded, your best bet may be to leave it as is and use a stepped ferrule. If you need an adjuster, you can use one inline on the housing.
If you want to thread it, start by measuring the ID, and seeing what the thread nearest available adjusting barrel has, then go to a tap drill chart like this one
to see what you need to drill it out to, then drill and tap it. The close clearance to the tube will make this job a royal pain, but it is possible. Now that you see the implications, you might decide to simply use the stepped ferrule.
In any case do not start the job, until you've laid out what you'll need, and how you'll do it.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance