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? mounting plate and new cylinder

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    $\begingroup$ Which explanation are you referring to? The link is missing... $\endgroup$ – user1853 Jul 10 '16 at 16:11
  • $\begingroup$ It looks like your first image dissapeared somewhere so there's no information about what explanation was there about. As to your question - would you like to position unattached cylinder to the surface ? Or how to attach it properly ? $\endgroup$ – Mr Zak Jul 10 '16 at 16:12
  • $\begingroup$ Rellinked the explanation. The unattached cylinder needs to be centered and located in the mounting hole (left or right) and then a boolean difference to change the size of the mounting hole. $\endgroup$ – Hertfordkc Jul 10 '16 at 16:21

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). enter image description here

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