OK. I've finally uploaded pics to the dropbox. They are labelled
starting "broken speaker...".

There is a text file explaining the pics as well.

The item in the picture that is not a speaker post is a 4/40 x 3/8
headless hex screw that I considered using as an internal fixating
device assuming I could find someone to drill and tap the existing ends
of the broken post.

Thanks for all the input!