The material I used for the rocker pivots was purchased from McMaster-Carr. I chose some 3/32″ precision ground 316 stainless shafting, P/N 1263K37, that was 0.0002″ undersize. Two 36″ pieces should be enough to make the pivot pins and all of the pushrods.
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All material, including the CAD drawings, relating to the construction of the Hodgson Radial presented on this site is free to use any way you see fit. However, no guarantees are made regarding the accuracy or correctness of the material presented here.