I've had my Copper John Pro for about a year and a half and my sight has never moved without me moving it. Call or email Copper John about the problem and I'm sure they will take care of it for you. They have super customer service. I spoke with Al Coon at Copper John when the fiber optics on my sight broke and he sent me a whole pack of replacements free of charge along with a copper john patch in 2 days of me contacting them. I have also heard of many other stories of super customer service from them. Contact them i'm sure they will take care of you.