extent along the sidewalls 76 and 78 to form a screen mounting in a first plane a screen 92 is illustrated positioned in the screen mounting multiple screens 92 may be employed in any one separator one or more shaker screens 92 may be installed in or secured to the shale shaker frame 74 with a wedge block 94 the screen 92 is placed on a support rail not shown and positioned underneath a stationary wedge guide 88 stop 88 the wedge block 90 stop 90 is then pounded into position so as to secure the screens 92 to frame 74 one of ordinary skill in the art will appreciate that the operator often chooses to use a combination of a hammer and a suitable piece of wood in contact with the wedge block 90 to deliver sufficient force to fully tighten the wedge block 90 as shown in fig4 the wedge block 90 may also include a hammer surface 94 to aid in installation as by pounding on surface 94 a and removal as by pounding on surface 94 b an inlet not shown may be located proximate back wall 80 the solids may then travel on top of the screens toward front side 81 as illustrated the separator has four screens 92 the drilling mud may be deposited on the first screen 92 a a sump 96 may be provided under the first two screens 92 a 92 b as illustrated sump 96 may be integrally formed with frame 74 one or more pressure differential devices as described above may be provided to generate a pressure differential across.