would a small laser pointer mounted to the bottom of the focusing block work for keeping things lined up thought I would try that thanks for any advise barney
And I'll add that over time you'll gain the ability to get your vise centered without any aid. I still use the special rod that comes up from the center hole some of the time, but I'm finally getting the hang of being able to turn the vise and see where I need to go to get to the center.