As you can see in the photo, the newer 66M blocks have a notch molded into the fanning strip at the beginning of each 5 pair sub-group. These notches will tell you if you are off by a half pair, allowing you to correct your small mistake before it gets to be a big one.
Wire stretching was a common practice on MDF's in CO's, when a wire transfer required moving the X-conn just a few terminals further away. It was a lot easier than a re-run on a 150-foot frame.
There is always room for a B-connector or a Scotchlok behind the 89B bracket, too, to correct mistakes due to severe cases of eyeball spasm and/or brain fart.
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