Hi Jonathan Tooker,
You are correct that quite a bit of explanation is included in the above comments, but it takes a while to plow through them. The short version is that Stern-Gerlach is not measuring spin directly; it is measuring spin-dependent scattering from an inhomogeneous field. And the inhomogeneous field is not described by Pauli's simple eigenvalue equation, due to the non-zero and non-trivial gradient of the field that must be included in the Hamiltonian. Instead, depending on the specifics of the gradient, there is a continuum of eigenstates, not binary eigenstates.
When the physics of the particle interactions are taken into account, the amplitude predicted by the local model can be correlated (in pairwise fashion) and the result (as shown on page 7) is the quantum correlation -a.b. Bell claims this is impossible, and the consensus today as evidenced by numerous statements in the physics literature is that "no local model can produce the quantum correlation". Bell assumes that the particle only precesses, but this is true only in a constant field, which yields null results and thus a logical contradiction. Bell apparently believes that he is measuring spin directly, and assumes spin can only have two possible results +/-1, thus he throws away the actual measurement data and replaces it with an abstraction, the +/-1 dichotomy. This prevents his constrained model from ever obtaining the correct correlation. In other words he is applying the wrong map, Pauli's (provisional) precession eigenvalue equation in a situation where it does not apply and it is likely that he is doing this because he is confusing the Pauli equation with the Dirac equation as I explain in the essay.
Believing that there is a difference between what local models (as constrained by Bell) and quantum models can produce in terms of correlations, physicists have looked for an explanation for that difference. They have settled on entanglement as the explanation of the difference. If a local model can produce the correct correlation, as mine does, then there is no difference between the local and quantum correlations, and this would seem to have some significance for entanglement. And as quantum mechanics does not contain the initial spin, and cannot predict each local result, but only the correlation, then quantum mechanics is incomplete, in Einstein's sense. My model should be capable of being tested experimentally, and this issue decided.
Thank you for your comments. I hope this short summary answers your questions and of course will be happy to try to answer any other question.
Best regards,
Edwin Eugene Klingman