Another thought on affixing the staple.
I have a #1 Phillips screwdriver that I ground about half the tip off of. I grind the staple legs to long points, drive it into the horn as okawbow described, and then run the screwdriver down the tip until I contact the staple. Then I give the handle a little tap with a plastic mallet to bend the staple tips over. It won't go anywhere.
And yes, the staple is to hold the strap in place rather than to hang the horn from.
John (Bigsmoke)