For anyone interested in pipe repair reborn pipes is a great site. Yesterday I finished splicing together a broken stem with the info from reborn pipes. There is the article below but there are others on the site as well.
http://rebornpipes.wordpress.com/2014/02/28/some-remarks-on-dealing-with-damaged-stems-of-smoking-pipes-by-jacek-a-rochacki/
http://rebornpipes.wordpress.com/2014/02/28/some-remarks-on-dealing-with-damaged-stems-of-smoking-pipes-by-jacek-a-rochacki/