I found that the forces on the handles of the rig can be quiet strong due to the leverage. e.g. when accidentally hitting a door.This T-connector is changed to be much thicker and stronger.blog post:http://marcuswolschon.blogspot.com/2011/04/en-extra-strong-t-connector-for.htmlphoto album:https://picasaweb.google.com/Marcus.Wolschon/20110325Bis201105ShulterRigBauen?feat=directlinkdiscussion:http://forums.reprap.org/read.php?88,75536project notes in my wiki:http://sourceforge.net/userapps/mediawiki/marcuswolschon/index.php?title=Projects/Camera/ShoulderRigThe through-hole side goes on the handle, the clamped side on the horizontal bar that connects the handles with the rig.