send it back to the manufacturer in the box it came in,a friend of mine sent back a very old weaver scope that he had for nearly 30 years because the nitrogen had finally leaked out and it started to fog up,they repurged it and it worked for about one more year,he sent it back again and the seals were shot so they sent it back fixed and sent him a new 3x9x40 along with his old one to keep for sentimental value,I dont even know if weaver has a lifetime warranty but they thanked him and wished him good service out of his new one for another 30years.SEND IT BACK!!