I bought two air horn and both of them were free to move, other problem one of them let air pass easier and the other doesn't like a resistor, and third problem they were with a separate air alimentation.
What i hat to do here was to make them fit near the other one with a fixation for the car (two hole 4mm D with 30 mm entraxe)
The air alimentation is a recycled bycicle valve fixed with plastic glue and it goe to Two hole 12mm D for usual pneumatic tubes that fit on air horn in general.
You will need Rilsan for this, why not a screw fixation? Because it's easyer to fix with Rilsan and for this you will need some of them for testing the balance of the air flow for both horn. I RECOMMEND TO USE THEM JUST LIKE HOW I PUT THEM for resistance in long term reason.
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Layer Heigh : 0.2
Infill : +/- 20%
Speed : Normal
Support angle: 30% - 40%
Pancake : With nutella