(re-upload! first try cut off at the end)
Saxophone repairman Matt Stohrer of http://www.StohrerMusic.com busts out another one-take wonder in this saxophone repair topic video addressing what he thinks might be the most important aspect of key fit: a snug fit of the hinge rod inside the posts. Watch as he fits a post on camera and explains some key concepts about how and why this works. DO NOT TRY THIS AT HOME. This video is intended to be explanatory in nature for consumers, and can serve as a viewpoint/reference for professional repairers.
If you like this stuff, consider supporting me on Patreon: https://www.patreon.com/mattstohrer
Also check out the Open Source Saxophone Project: http://www.OpenSourceSaxophoneProject.com