I have an old SS 10X42M model that I got around 2001. I zeroed it at 100 yards, and have'nt touched it since. The other day I went to turn the turrets, and they were almost siezed. I had to wrap my fist around the whole turret, and use alot of strength to turn both the elevation, and windage turrets. Is this common with the older models? My buddy has the same model that he just got and his turrets turn with two fingers, and have louder, more smoother clicks when doing adjustments. Thanks in advance.