i was missing that horn button thingo when i bought my car
if i wanted to use the horn then i'd have to press down on one of the connector thingos near the edges of where the horn button should be
i just made one up of what i had lying around... namely 3 bits of cardboard some foam from something i ripped apart and some spay adhesive (because i couldn't find any double sided tape lol)

, very very easy fix and no cost, works perfect and noone can tell cos it's hidden under the rubber bit.
so if it's just the button bit missing and u cant find a spare one, then u can just do that
