I hope you find a new horn. They can be tough to find sometimes. You could try mitre bond. I have used it for lots of things. It is really strong. Take the driver off and try it. Actually you may be able to leave the driver on and use it as weight. Mitre bond sets up in about 15 seconds so make sure you are aligned. https://www.amazon.ca/MitreBond-Aerosol-Activator-Superglue-Adhesive/dp/B01HR340QW . Good luck!