One of my trumpets leaks oil like crazy...three fingers on my left hand are nearly dripping with the stuff during practice. This is only on one of my horns. The others do not exhibit this phenom (thankfully!). The oil appears to come from the very top of the seam at the bottom caps, but I'm not really sure as to the origin. It is not coming from the bottom of the caps where the hole is. All caps are snug and secure. I have to keep a rag in hand to prevent myself from getting all oiled up. Is this normal? Any thoughts or suggestions?