I was having an issue with the CRT distributor rotating from its set point which I think I have solved. During the re-time the vacuum advance now throws way too much advance in. With the vacuum line unhooked & plugged total advance is about 38 degs at 3,000 rpm. With the vacuum advance hooked up total advance is 50 degs plus at 3,000. I recall that Ted posted that for the CRT vacuum advance to work correctly you have to take an allen wrench into the diaphragm inlet and tighten it all the way in and then back off some amount of turns. I have quickly looked for this post but didn't see it. I will look further back and try to find this post but any help would be appreciated.  
Also, having the CRT parts bag out I find the piece below that I have never installed. Can anybody tell me the purpose of this piece is and should it be installed? CRT instructions aren't the best.