Not even a year old, this Air Zound has stopped working. Holds pressure OK but only makes a hissing noise, no loud "HONK"... Tried the turning the large dial on the backside of horn like instructions say: "1/4 to the left/right" but it is frozen tight....so tight if i tried channel-locks it might break the horn, surely voiding warrantee. No replies yet from DeltaCycles.................. Any ideas how to fix this thing?