wait till your clip that holds the locking lever button together comes off! Your bike will take off like a horse that been bit by a horse fly! In the process your spring under that button will launch the button and spring into low earth orbit.
I fixed most of( I missed one bike just looked) my bikes buttons by drilling a very small hole through it and cotter pinning it in place of the sorry c-clip.
couple of pictures of what I did.
pointing to the cotter pin and washer on the button
another view of washer and cotter pin