I just got a Vulcan III rack with all the attachments and I'm having some difficulty using the chinning bar. I've noticed you must be very precise with the positioning of the uprights in order to get the chinning bar in place. It would have been helpful if the blue spacer bar came with millimeter/ inch markings so you could more readily tell how wide the uprights are. I'm probably going to make some marks myself on the blue bar to indicate exactly the spot needed for the chinning bar to fit, as well as the width I prefer for dips. I'd like to hear how other users of the Vulcan III rack have dealt with this issue and what you might recommend to use for marking different widths on the blue bar.