of trough 10 and be pressed into the selected hook of the socket retainer 11 if the arm 14 is shaped correctly it will when hooked into strip 11 apply a downward bending force to elastomeric head 15 causing the bottom surface 33 thereof to be pressed tightly against the upper surface 34 of trough 10 in fig6 it may be seen that by providing a product drawoff hole or entrance at 26 connected to appropriate retrieval piping or tubing a desired product of particles of a special density in an aqueous slurry may be retrieved the positioning of a splitter head 15 and arm 14 may be placed appropriately to divide the desired product into stream a to exit through entrance 26 while the remainder b of the slurry can continue on down the trough 10 to another separation or to collection point the position for splitter spine 16 is determined adjacent a drawoff hole 26 and a hole is drilled there to fasten the spine 16 at that point the hook socket retainer 11 is located upstream in this embodiment at a suitable place along outer rim 27 of trough 10 and another hole is drilled therethrough to affix the retainer 11 to the rim 27 of trough 10 fig3 shows a hook socket retainer 11 as a punched out flat plate the retainer 21 will be bent along a radius to curve same to fit along the outside rim 27 of.