This was done with stop-animation. There is a serrated windage knob on the bolt-handle side of the rifle just before the upper handguard. My hand was just not in the pictures. Friction, by years of dust accumulation, does help the base to stay in place when the knob is turned. Same can be said with friction helping to hold the leaf on the latter stay in place too. Ha. Go to M1903dotcom to see the different M1905 sight assembly variants that were fitted to the Sprg, R.I., and Remington '03 rifles.