On Sat, 14 Dec 2019 22:33:55 -0800 (PST),
wrote:

How long is your post? If it's 2 feet or so, no problem. On the other hand, if it's 10 feet, you have a situation.

jayemm

jerry rig a square (90 degree mounted) platform to the post and mount
a benchtop drill press to it. Finding the center is a no-brainer - and
the bost could be 16 feet long - it won't matter because it can also
be used as a horizontal boring machine