Hi, I might be doing it all wrong but here's the thing.
When I turn the screw clock vise or anti clock vise nothing happens. The string will go slightly flat or sharp, so I tune it up back to pitch. But the intonation stays the same.
What can I do? It seems my guitar won't intonate.
It sounds like you're mssing something.
JJ1565 has a link in her sig to the procedure. Check it out.
Moving on.....