I've often wondered how Ford assembled the horns to the firewall in '13-14. It is difficult for me to do, and I suspect it is for others too. I've established they used a #9 X 7/8 RH slotted screw. Since they were assembling cars at a rapid rate, I wonder if they didn't have a special offset screwdriver? A '15 would be even more difficult.
I have not started to assemble my 14 touring project but I have pondered the question you posed re the horn. I really don't have an answer but I have seen factory photos where the entire firewall with horn, hood former, coil box and steering column was assembled as a unit prior
to being fit to the chassis. I suspect that was much easier to do than adding parts to a mounted firewall. My only thought is to position and run in the screws without the horn; remove them and than mount the horn using an 90% offset screwdriver. That way the screws would go in easier. My 2 cents worth; hope someone has a better idea. Dennis
The horn screw holes are drilled at an angle to allow the screwdriver to clear the horn on assembly.
Royce, do you know that for a fact? It makes perfect sense, but only 10% of the screw would be making contact!
On my '14, I did as Larry said, I put the horn on with one screw, marked the location for the other screw, pulled the horn, predrilled the hole and reinstalled the horn and used an offset screw driver to install the other screw.
Marking the location for the screws is not an issue. If one chooses to use the correct wood screws that I noted above, it is a real hard job getting them in, because you can get a straight shot at them. An offset screwdriver is a good idea too, but it doesn't work! They are too tall. That was the whole reason I posted this question. What did Ford do? I got my two screws in, but it is a pain in the butt.
I believe they either used a standard screwdriver and just tolerated the frustration--if you're doing a thousand a day, six days a week, you'd learn to adapt--or they used a special screwdriver, the type with the u-jointed end.
Lag studs and acorn nuts is the easy way..
Ricks, those studs are called "hanger bolts" ;<)