the unilite I have doesn't have a metal portion in the center.
It has a carbon rod.
very easy to break off and arc to the rotor if it is missing.
it will burn out the unilte electronics as well if you leave it like that.

perhaps they changed it since I got mine.

Like this one.


I burned out 3 before they figured out I snapped the center off.

Last edited by Andrewh; 01/31/16 09:44 PM.