@colinwalker can’t imagine hiding menu bar. No non-running apps in hidden dock & Alfred here. Occasionally use full screen and then often split. I like a contextual menus and used FinderPop pre OS X. Good to have options.
That link shows you how to do full size spacers, but This link will show you how to do Small spacers as well (and a photo of the difference between the two). I prefer the look of the small-spacers for a smaller dock profile.
@DaveyCraney thanks for the link - the images really help for deciding which spacers to use.
I haven’t tried it yet, but before I do, I guess I should ask how I can remove these/reverse this?