Abstract: The invention relates to a ball draw-off apparatus for shaft prostheses with balls (3) which can be placed onto the prosthesis neck (2). The apparatus has two rotary bodies (5a, 5b) which are rotatably supported in a housing (4), which can in each case be rotated with a lever arm (6a, 6b) and which with their axes of rotation (7a, 7b) lie in a common plane and form an open gap S in the projection onto the plane F for the introduction of the prosthesis neck (2). The rotary bodies have a profile which with increasing rotation decreases the gap S for clamping the prosthesis neck (2) and causes an increase of the distance of its upper edge (9a, 9b) from the plane F in order to produce a draw-off force P at the placed on ball directly or indirectly via an intermediate body.