Here some close up shots of the two center poles I have, showing the lip that the hub rests on.  Notice the two different locations of the support.   In fact, if the lip were placed even higher on the sleeve, the bottom part of the center pole can be shorter and the top piece longer.  

The hub must have something to rest on, and the small lip welded all the way around the pole sleeve provides a perfect support.  This lip doesn't need to be bigger than about 1/4 inch, unless you really have a hard time cutting the hole in the hub.  If so, and your hole is larger and/or sloppy, you may want a 1/2 inch lip

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