I've got an old pair of safari 8x22's. When I go to focus them one side moves and the other lags behind about an 1/8-1/4". I've had the things for I don't know how long. Is it worth trying to get them repaired or should I just replace em and be done with it? This is my only Steiner optic and I've had no dealings with the factory before. Thanks for any help.