Thanks Tarka, looks good!
I have two-tone horns on the 1150, work great, cheap as chips. I don't think you can get the result with a single note / tone.
Put a Stebel compact on the 1200 but it stopped working, likkle wheel rattling round like it came of the shaft. Hi temperature no likey, most likely.
Dying to put airhorns on the 1200, free virtual pints for life to first man who shows how to do it nicely!!
Bin