A rail securing mechanism comprises an outer wall portion and an inner wall portion, the outer wall portion and inner wall portion configured to retain a portion of a rail; a recess between the outer wall portion and the inner wall portion; and a rail securing assembly at least partially disposed between the outer wall portion and the inner wall portion. The rail securing assembly comprises a medial bar at least partially disposed within the recess; a tightening bolt; one or more outer wedge pieces; and one or more inner wedge pieces disposed between the one or more outer wedge pieces and the medial bar. Rotating the tightening bolt causes at least one of the one or more outer wedge pieces or inner wedge pieces to protrude from the recess into a space between the outer wall portion and the inner wall portion.