Interesting that this is your first post as a member of this forum. (I'm not implying or inferring anything, just making an observation.) Coincidence can be a funny thing at times.
The GO/NO-GO extractor bar block used for the standard SW1911 ... (meaning I haven't yet asked about the Oversize extractors on the Enhanced models) ... is a machined steel bar. The GO end lists a measurement of .4175 and the NO-GO end lists .4225.
The dimension checked by the factory provided bar gauge is from the hook's "outside" edge, or tip, to the opposite side of the slide, with the bar gauge being inserted from the bottom of the breech face. (NOT from behind, or from inside, the hook to the other side.)
The NO-GO end of the bar gauge should not fit between the hook and opposite side of the slide. If it does, then material is filed from the extractor's adjustment pad and the parts reassembled and checked until the NO-GO gauge does not fit. The GO gauge should fit.
S&W stopped selling extractor Flag gauges to 3rd gen pistol armorers some years ago because they determined it was no longer a necessary inspection due to improvements in manufacturing tolerances (what we were told).
The flag gauges had GO/NO-GO ends used to check the dimension from the inside/back of the hook to the breech face behind the hook, meaning clearance for the case rim tolerance. My earlier 3rd gen extractor gauge sets for different calibers included flag gauges (new ones don't), but my SW1911 and M&P gauges don't have them (again, not available or considered necessary).
The extractor spring tension is checked using a Wagner Force Dial FDK.FDN Series Push Pull Force Gage (FDK 20). A "pull" hook attachment that comes with that gage is placed over the extractor hook, when the slide is positioned in a vise so the extractor is free to pivot, and the tension is checked at the point when movement of the extractor tail is detected as the hook end is being pulled with the gage. This takes a bit of practice, and some hooked extensions which have come with some of the gages have exhibited a better cut on the tip, which could more easily be held stationary on the extractor hooks while pulling on them.
That image you posted doesn't show how the dimensional checks are made with either the current bar gauge or the older flag gauge. Are you just using it to pull against the inside of the hook?
What sort of gage are you using to measure the tension? The first movement of the extractor tail (hence the manual listing of only .010" deflection) is the moment when the tension is checked using the normal gage. (Otherwise you risk getting a heavier reading.) The tail's movement is easier to see than when looking at the front of the extractor, believe it or not.
If I didn't list it earlier in this particular thread, the standard SW1911 extractor is that from the 3rd gen .40 pistols (last time I ordered them, anyway). They are not the same as the Oversize extractors which come on the 3" Pro Series or the Enhanced models.
The .40 extractor on the standard SW1911's has a nicely beveled hook (it's a revision previously designed to optimize feeding on their 3rd gen .40's with the increased slide velocities produced by that cartridge). Here's an image of the standard SW1911 extractor showing the nice machined cuts behind the hook, and the beveled hook edge.
Interestingly enough, while I bought the SW1911 extractor gauge just to add it to my armorer tool collection, I've been told by one of their armorer instructors that the tolerances on the newer guns being made are such that more often than not the extractors are dropping into the slides of the SW1911's without having to be fitted. I'd still check using the bar gauge and the force dial tension gage, just to make sure, of course.
BTW, I realize I've been using the 2 different spellings of "gauge" & "gage" throughout my post, but I've done so deliberately, following the spelling used in both the S&W armorer manual and by the force dial manufacturer. Confusing, perhaps, but a way to practice some small bit of discipline in the weird world of words and their spellings.
If you lived close enough, and we got to "know each other" a bit better through the forum, I'd probably offer to let you see the tools purchased from S&W for armorer use, and demonstrate how they're used. (This is NOT an open invitation to all the forum members who might live in Northern CA, BTW.
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