  For precise measurements with polarized neutrons high efficient
spin-manipulation is required. We developed several neutron optical elements
suitable for a new sophisticated setup, i.e., DC spin-turners and
Larmor-accelerators which diminish thermal disturbances and depolarisation
considerably. The gain in performance is exploited demonstrating violation of a
Bell-like inequality for a spin-path entangled single-neutron state. The
obtained value of S=2.365(13), which is much higher than previous measurements
by neutron interferometry, is 28 $\sigma$ above the limit of S=2 predicted by
contextual hidden variable theories. The new setup is more flexible referring
to state preparation and analysis, therefore new, more precise measurements can
be carried out.
