Tri-Five Chevrolet cars have similar horns. I was looking for more details on horn rebuilds and came across this post. I was successful to get noise out of my low-tone horn by the following steps: - drill out all the rivets - this will allow all components to separate - Take pictures of how each piece in the assembly comes apart - I used some very fine media (700 grit?) in my HF sandblaster to clean up all pieces. - my thin metal piece (reed?) looked to be in better shape than yours - I had a local gasket shop make a gasket to replace the paper one that had been in place since it was new!!! try to match the thickness (.035"?) of the +60 year old one - look at the face surface of the cast piece. I think this should be flat, check with a metal ruler or straight edge. I had to take a sanding block to level out the high spots, this takes time to accomplish - Use your pictures to re-assemble. I elected to use 10-32 allen-head screws, washers and nuts because I could not find the correct rivets. Tighten them in a star pattern. - It makes sense to me that this reed is in a correct state of tension, not sure what that is or how to measure it!!! - Spray assembly with self-etching primer, let dry and then spray with correct shade of black to match your under-the-hood parts. I am not sure this is the correct way to do this, that's why I am looking for validation or someone else's method and suggestions. i think we can benefit by posting a picture so we all know what to use a multi-meter to check out continuity and voltage readings. There are some details on horns in the 1958 Trck shop manual.
