Carry_Up said:
What is actually meant by "ejector rod runout"? Technically runout checks whether the ejector rod is bent. ...........
I think that this is the OP's original question: how "bent" is OK? On the Security Sixes (as well as S&W's) the only locking of the front of the cylinder is the "dimple" in the end of the ejector rod mating with the "nub" on the barrel. (To me, the new style crane locking lug of the GP and SP series are one of their best features.)
His ejector rod is bent enough that it causes the yoke to push out from the frame on two chambers.
Back in the 1980's, I had the same problem. My ejector rod had enough "runout" that you could see it with the naked eye. My attempt to fix it was to purchase several new (from Ruger) ejector rods. Of the two or three from Ruger, only one was straighter than the one installed on my revolver - and it was "dead" straight. So, 30 years or so later, my Security Six is still wearing that one and doing fine.
So, how bent is too bent? I do not know, but my choice would be "no bend", if possible. OP says his shoots fine with some amount of bend, so that has to be the ultimate test. But it would bug me knowing that it was not straight, and the yoke was being forced out.
Not sure if bent ejector rods can be satisfactorily straightened or not, but I think I would round up a few used ones and see if any were any better than what I had. And if not, I would "experiment" with getting one of the rods straightened, either by a Gunsmith or some home brew methods.
Edited to add: I just checked http://www.gunpartscorp.com, and they have stainless steel ejector rods for about $6.
Also, here is a tool at Brownells (http://www.brownells.com/gunsmith-tools-supplies/handgun-tools/crane-tools/extractor-rod-yoke-alignment-tool-prod9846.aspx?clickid=wGPyYxww7RBeXwt1VwWqh2VhUkWSBi1d3W590w0&aid=27795&source=ir&ch=aff) for checking and straightening Security Six and S&W ejector rods.
