b3buggy;
But then i tried the orion stock core and it was screeching again, doesn't sound like chatter as i use lathes at college.
There is
something that is loose that is causing the problem you are seeing. It may be as simple as the Driving O-ring being stretched out and not pulling the Armature down into the "V"-blocks solidly enough. Don't let the O-ring run in the windings as this can cause problems too.