i have a vintage Bausch & Lomb 6x24 with external windage and elevation knobs. a couple questions. i mounted it on a pre 64 win. bull bbl. 30-06. the tube dosen't slide in the "rings" eaisly . and, does not "return to battery" on its own. any suggestions? next: the elevation knob is centered on the tube. but, the windage knob is not. the button that pushes the tube is 3/32 to 1/8 in above the tube center?? last question; what is the purpose of the 3rd adjustment on the lower left side rear?? anyone have literature that came with these scopes and could send me a copy?