How to center a cylinder on an existing hole in a mesh? Given a project with many mesh objects which have the wrong size mounting holes, I've created a bored cylinder with the correct bore diameter, which I intend to boolean union in the existing holes.  However, I'm missing how to center the new piece on the existing holes.  There is a nice explanation [align two objects][1]][1] for centering objects, but I don't see how to modify the explanation to my problem.
Is there an easy way to align two objects on a specific axis?
In Edit Mode select the hole's rim with Alt+RMB and press Shift+S-->Cursor to Selected. Then in Object Mode select the cylinder and press Shift+S-->Selection to Cursor (Offset).