Place the mount over the flange nut with the (2) 3-48 tapped holes toward the barrel end. Line the 3-48 tapped holes in the mount up with the holes in the side of the receiver and put in the (2) 3-48 socket head screws.  It is very important that these holes line up to keep from damaging the threads when the screws are installed. DO NOT TIGHTEN! 

Move the nut around with a pin in the hole until the round part of the nut slips into the counterbore in the bottom of the mount. Put the 10-32 x ⅝ flat head screw through the mount and into the nut. Tighten this screw and the (2) 3-48 socket head screws. The 3-48 screws don’t need to be real tight! 

Put the 10-32 x ½ set screws down through the tapped holes in the top of the mount and tighten against the receiver. The purpose of the set screws is to keep pressure on the 3-48 socket head screws. Do not try to remove the 3-48 screws with the set screws tight! 

You can also get some vertical adjustment if you find your gun is shooting low. Loosen the 10-32 flat head screw & turn the set screw closest to the 10-32 screw clockwise. For every ¼ turn of the 10-32 set screw you will move approximately 8” at 100 yards. Retighten the 10-32 flathead screw.