Took apart a Zenith carb from an early 40's model DC4 yesterday and this carb has two venturi's in the carb throat. The larger one is the standard type that drops into the carb casting, while the smaller (inner) one is supported inside the larger (outer) venturi. It seems to be suspended there on a pair of arms that radiate out from the inner venturi. The inner one seems to "hang" in a couple of slots in the outer venturi. The inner one is not fastened tight when in position, it just sits in these slots and appears as if it can move a bit which I'm sure is incorrect. Should this inner venturi be stable when in place? I was thinking of trying JB weld to secure it since those venturi castings are pot metal. The outer slots are worn a bit from the movement. Can anyone explain to me how this was originally kept in place in that assembly?
Also, are magneto parts for this "Case" magneto available? Any parts source would be appreciated.