[quote name=\"Roller\"]The bolt with the double step on the end is the modified one. The step is the original bolt diameter .275, the other diameter is the increased material, .020 per side, but is shaved on the side to fit in the .437 diameter. The web thickness at the thickest point is now .027 vs the original .007. Thickness on the .437 diameter tangent side is still thin. Seems to be working though, extractor tips are not flexing and cracking.
Frank[/quote]
The original is a poor design. I have never seen a commercial gun extractor without some means of flex. Powder residue, dirt, rim variations between brands and more require some \"give\" in that area. In our case, machining tolerances come into play also. Sadly, I expect the flexing and cracking to reappear, its just going to take longer. With the original .007 wall it could happen on the first close of the bolt!