Improved Horn brush
This vital component lives in your steering wheel and allows your horn push to contact the horn brush. Problem is that most of the ones you find out there don't fit, and in fact, we often find horn push buttons laying on the seat, because the whole deal is messed up.
A Bugeye horn requires the right parts to work properly (ever notice how many Bugeyes have a remote horn push on the dash? Too many!) Start with the correct horn brush that actually fits and you'll be on the way to a nice factory restoration.