Here is a pic of the wire clip - recrimp the U ends over the cover's screw area and check that the 2 hooks on each side of the horn cover are in place also, then put the 2 screws back in and snug up pretty good but don't over do it.
Reinstall the airbag on the steering wheel as you reconnect the 2 wiring plugs. Center the airbag on your steering wheel by looking at the gaps at the edge of the horn cover vs. the cruise switches then snug and tighten the two 8mm headed bolts and reinstall the plastic screw access caps.
Does the horn need more pressure to make it work? Yes, but not that much more.
As you know, the horn button doesn't normally get a lot of use anyway.
At this point, I admit I don't have a lot of time on this fix, I guess the silicone could degrade over time or the glue could let go, but I didn't see a lot of choices short of buying an air bag. If it fails, I tend to think it will just stop the horn from working rather than making it stick ON. Edit 3-30-10, 10-27-10: Still working fine, but don't really go around honking my horn a lot either.
Main issue for me was the fact that the cruise wouldn't work when the horn button was stuck (before I replaced the horns, so no noise). The stuck horn button caused the horn relay to heat up and go bad and the cruise would not work with a bad horn relay in there.
That's all on the horn contactor (except for pic at bottom).
REPLACING THE HORNS
(Before replacing the horns, after
taking them out, first make sure they are bad by checking with a separate power source....I used a battery charger, but you could connect them direct to the truck's battery too.)
1. The horns are up under the front of the passenger side wheel house. Take out the various front and center wheelhouse bolts, screws, and push in clip(s). Pull the front of the wheelhouse down and hold it with a strap or let a helper hold it. The wheel house will bind on the inside edge of the fender and probably bend this edge a little, you can tap it back into place with a hammer handle or plastic hammer when you get the wheel house back in place.
2. Take out the battery, then there is only one bolt holding the whole two-horn assembly - the bolt is about even with the front edge of the battery, but the battery is in the way enough that it is easier just to take it out.
3. The new horns come with a bunch of adapter type stuff you won't need, just reuse your old wire connectors and mounting bracket, but the contacts on the new horns may not be in the exact same place as your originals, but it all ends up pretty close to original, just make sure the wires don't end up in a position where they are going to get rubbed through. Also, note the horns are marked "H" and "L" for high and low tones, keep them in their original locations on the mounting bracket. I think the horns were around $75 for the pair, but the Ford parts guy gave me a deal, I think you are talking around $95 normally but can't remember for sure.
CRUISE CONTROL FIX
If you messing with your horn contactor, chances are you may have Cruise Control issues as well....so here is a link to a thread with my trials vs. the cruise control: Cruise Control