Are they easy to fit robin? Have you any install pics?
....Fairly easy to fit (unless if by me!). High lift ramp or pit is needed and space in the horn area is very confined, hence why I have bought cheaper ones as the expensive ones have bigger trumpets which won't fit.
I only have this pic from when I had 2-tone airhorns:
^ The compressor failed on those too! They only lasted just over a year but my current 3-tone (single chord blast, not a song) have lasted about 3 years.
My new ones are being fitted on Wednesday so I'll take pics but we may only replace the compressor - We'll see how it goes. But if there seems to be enough interest I guess I could write a short Review if not a How-to Guide.