Just a guess but you might try the help section at the local parts store for the cancel springs in the links.
https://www.google.com/search?client...+cancel+spring
https://www.dormanproducts.com/p-2363-49312.aspx
https://shop.advanceautoparts.com/p/...312/17190371-P
Typically the horn button provides a ground to the horn relay, which might be near the fuse panel. I'd start there. Does the relay click? You might also check for voltage at the horn when pressing the button.
Here's a link for the horn bits. I'd look at the pics and then under the horn button.
https://www.google.com/search?client...sclient=psy-ab