Hello guys, I don't even know the terminology for this, but I have a flexible shaft tool that has a cable which attaches directly to a motor shaft. The cable has a little cup that slides over the rotor shaft with a set screw, but the cup is a little bigger than the rotor shaft so it is off-center and vibrates when it rotates.
Is there some way to center this? Like some kind of collet or something I can put on to make it perfectly centered or build up the motor shaft so it is a little bigger?
(these are example pictures from the internet but they are the same as mine)
Here is a picture of the cable, the brass cup goes over the rotor shaft:
And here it is attached to the rotor shaft: