Okay, so I agree it's a two piece design,. My mistake was assuming that the original concern was that the handle was tacked on like the Remington 700. It obviously isn't. The handle is one piece with a collar that slips onto the bolt body, and the collar is brazed on. (IMO superior to the Remington 700. The contact area of the brazed collar is significantly greater than the contact area where the 700 handle meets the bolt.)

I also said there is no evidence of brazing material and I think I am wrong there, too. My mistake there was believing the brazing material would be like that seen on the Remington 700 - a metallic bronze color. But the Winchester apparently uses copper. And I believe there is evidence of that in that area. One of my bolts has some turquoise coloring in that area that might be some left over copper, maybe some overflow, or from copper infused flux, that looks like it was perhaps polished then blued resulting in the bluing salts oxidizing the copper into its tell-tale turquoise color. That turquoise showed up on one of the earlier pictures I posted.

[Linked Image from i.imgur.com]

I do wonder about the "quite a few" assertion. Unlike the Remington 700, I yet to come across any proven account of an M70 bolt failing. Even failure of the 700 bolts are few and far between, usually involving abusive practices, or home-gunsmithing that resulted in a weakened joint.

[Linked Image from i.imgur.com]
https://vcdl.org/