I was talking with Bobby at Dallas Frame doing the walk through on my wagon frame swap. He asked me if I wanted to replace my Moog idler arm with the GM Idler arm. So I asked him why. He said that the maligned GM idler arm is a good design that some alignment guys don't know how to use. He said that they think that it is worn out, when, due to its design, it just needs to be readjusted. I do not know exactly what it looks like or does. Just repeating what he told me. But I did find it an interesting observation.