Restoring my vans alarm horn

This afternoon, I checked my van for possible damages or parts that need repair because I hear something unusual in the front hood. I immediately open the hood and check it. I have found that the alarm device was detached from its alarm stand that's why it produces "blingbling" sound. Luckily, I have brought with me my tools and some epoxy materials so, I immediately loosen the bolt and screw of the alarm stand then I mix the two components of the epoxy and start fixing the crack parts of the alarm device. I have waited for 4 hours to let the epoxy dried. I started to install the alarm horn around 8 o'clock in the evening. I have to use my headlamps to have a clear view on the bolt holes beside the engine parts. After a couple of minutes, I finally restore it back to its original position.