A finely positionable cavity moulding tool, characterized by a solid form (1) and a movable form (2), with multiple positioning projections (21) positioned on the upper end surface of the movable form (2), and where the fixed form (1) provides for several positioning lines aligned with the respective positioning projections (21), and where a positioning surface is one facing the middle section of the moving form (2) of the respective positioning projections (21),and with a side area facing the centre section of the fixed form (1) of the respective positioning lines at the corresponding positioning surface.
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