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?

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Hertfordkc
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2Which explanation are you referring to? The link is missing... – Jul 10 '16 at 16:11
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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 ? – Mr Zak Jul 10 '16 at 16:12
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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. – Hertfordkc Jul 10 '16 at 16:21
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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).

Paul Gonet
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