How can I center my drill

[bluegrallis]

I have a broken bed post. I want to drill a hole for a dowel on each piece so I can glue it back together. I would like to hear any ideas as to how to go about this.

Well, I finally decide to do this and get it out of my way. I roughly marked center and hand drilled the bottom for a good fit for the dowel. Theh I did the same on the top piece, but wallered the hole out a bit. lathered it up with gorrilla wood glue and clamped it . It centered up OK and doesn't even look too bad