Go to classicparts.com and order part# 27-225 Horn contact spring and bushing. It goes in the third hole in the steering wheel which is not threaded.
Are you able to pull the horn wire out far enough to add a wire to the end of it? If so, you won't need to pull the steering wheel.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission