Sometimes when I have a complicated component with a lot of holes very close together, how can I select the centerline that I want? It just feels clustered and I'm guessing at which line I'm pressing. And can I just press on the cylinderical face to infer a centerline? Is the correct way to hover over a cylinder and then click on the centerline?
While the measure command dialog is active, Set selection filter to 'Curve'.
Without setting any selection filter, hover mouse over the object in UI and wait for quickpick. From quickpick dialog, select 'Construction Objects' and from the list you can make selection accordingly.