A full extension ball bearing drawer slide assembly comprised of a fixed member attached to a cabinet piece, a middle member slidingly engaged with the fixed member with a set of linear bearings, a drawer member attached to a drawer piece slidingly engaged with the middle member via a second set of linear bearings, and a drawer retainer mechanism attached to the drawer member and in adjustable contact with the drawer member. The drawer retainer mechanism is comprised of a frame attached to the drawer member, a housing seated in the frame, a piston fitted in the frame and biased by a helical spring adjacent a post. The post has a threaded section engaged with a threaded hole in the frame. The piston, biased by the helical spring on the post, is forced towards the housing by a raised indention in a race of the fixed member.