Hi Fred and Jeff … Thanx for the replies … I guess I should have been a little more specific … I want to center the Head directly in the center of the Chuck Rotary … I make Pens and engrave on them … but I’m using my eyesight to Center … as I get older the eyes aren’t what they use to be 
… just hoping there might be something I can make to help in the process.
Thanx again
Take Care
Brian