Arouse the DAMPFHAMMER!
Just saw your header @Bjorn. What lengths does primary and secondary have, measured from flange till crossing point of the two stream filaments (center lines) for primaries and for secondaries from crossing point till crossing point? It looks like 400 mm/280 mm, which would fit quite well a 86x86 drag engine.Give it a nudge. I tried to make my own. It runs......