The horn working when you rub the lead shows that the horn Contact switch ,inside the horn had developed loose contact/wear out...If the horn has screws on the periphery which can be opened then you can see the contact ...if it is sealed, say good bye to it and get a new one.
The pic of metal piece you posted is the wire harness hold down ,clamp.If you see the clamp, it has a screw hole into which a small machine screw will go in and the thread for the same is in the lower part of the switch assembly...I will try and post a pic to-morrow after 11 AM.







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