The way I put them on my wife's 5906 was after removing the factory grip was to hold the pistol straight up, barrel facing up, take the new grip, sliding the top of the grip at an angle into the beavertail with the hammer strut and spring still visible, slightly start the black plastic locking block on to the hammer spring cup, keep pressure at the top of the grip, angle the bottom of the grip to the frame, while inserting the locking block further into the grip, place the butt of the pistol, grip, and locking block on a table, insert small punch through the grip and locking block while still pressing down on the pistol butt to table. Then take your factory grip pin and start insert it from the left until it pushes the smaller punch out to the right side of the grip approximately an 1/8 of an inch, take a very small plastic headed or similar type hammer and gently seat the grip pin all the way through. Verify hammer operation and enjoy! Mine fit snugly with zero wobble or play. Shot approximately 150 rds with no lose feeling at all. I apologize for the poor instruction, but that is what worked for me.