Abstract We propose ETi 250 Parts a four-dimensional supersymmetric theory that deconstructs, in a particular limit, the six-dimensional (2, 0) theory of type D k.This 4d theory is defined by a necklace quiver with alternating gauge nodes O(2k) and Sp(k).We test this proposal by comparing the 6d half-BPS index to the Welding Helmets Higgs branch Hilbert series of the 4d theory.In the process, we overcome several technical difficulties, such as Hilbert series calculations for non-complete intersections, and the choice of O versus SO gauge groups.Consistently, the result matches the Coulomb branch formula for the mirror theory upon reduction to 3d.