Has anyone else had the problem of the rear site on the Thunder 380 "walking" side to side while firing. What would be a good fix. I can find no screws that hold the site. A worker at the range today said I could superglue it. I wanted to check and see if that would be recommended. I confess that although I have owned the Gun several years I have not shot it much. This is the first issue with the gun. I'm sure there is an answer so thanks in advance for the help.