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heres the deal. theres a threaded hole in the bottom where something screws in and is the input for air as well. i can only guess its a threaded hollow tube that screws into the horn mounts thru the roof (semi) or deck (boat) and then gets bloted tight & the air hose hooked to it. then there is another hole for a bolt, but thats it. i cant find anything that matches that thread pattern let alone matches & is hollow. i havent tried the center of a lamp yet, if you know what i mean. has anyone seen this set up before? signaltone was in Livonia, Mi but i havent found them in searching online. it looks like its supposed to be exterior mounted. thanks for any help. AXE