Dave, great discovery and info on the cure as mine suffers the same fault
Thanks for posting

My pleasure

To help further and act as a useful visual lreference, this image was actually taken after I'd driven the three contact pins firmly down their roll-pins.
![[Linked Image]](https://i.ibb.co/SXBphc4F/20250330-162520.jpg)
After this the mechanism was very tightly clamped together and the horn action went from horrible and largely unreliable, to a delight to use with perfect repeatable horn sounding
