I found this thread on Videohelp.com about a DIY'er attempting to replace a CRT for the first time by himself. He found Hawkeye, and bought a replacement tube from them. He just installed it, and is in the adjustment stage right now. The tube came with a yoke already installed by Hawkeye, but he is being given advice to adjust it - I assume that Hawkeye does all the yoke adjustments in advance.

I just thought that you might be interested in reading this.

http://forum.videohelp.com/threads/319920-Refurbished-%28Rebuilt%29-CRT-picture-tubes