"Scott" wrote in message
...
. . .put the rod inside a piece of sqaure tubing and scribe two lines
across from opposite corners in which case the lines will cross at the
center of the square tube and thus the center of the rod as well...

Scott..........

Take this opportunity to buy the tool which is made for this task.
http://www.harborfreight.com/cpi/cta...temnumber=4185

The little attachment in the middle is the one used for marking the center
of a rod diameter. Making the mark is simple. Centerpunching it accurately
and then drilling it on center and straight is a completely different story.

Rich S.