I have a C85-12F that was installed in my Culver LFA. The primer was completely removed at some point. What manufacturer made the original primer? A mixture control, installed in the original primer location, has been disconnected. The carburetor is a Stromburg NAS3A1. Is there a thought as to why the mixture was disconnected? I understand that below about 5,000 feet the mixture is really not necessary. I fly over mountains above 5,000 feet.