turntable 204 the light bar may be positioned in a second plane perpendicular to the first plane and independently of the movement of the light bar by scanner assembly 70 34 further after the orientation of the scanner assembly 70 34 relative to laser 64 34 has been determined by pivotal movements of turntable 202 and cradle 220 the adjustable mirror holder assembly 236 may be manipulated to properly direct the light beam from laser 64 34 into scanner assembly 70 34 as mentioned above the base member 238 may be fixed in a 34 course 34 adjustment position on turntable 220 by tightening lock bolt 248 further a 34 fine 34 adjustment of the pivotal position of mirror 272 may be effected by loosening one of the set screws 254 256 and tightening the other of the set screws to pivot post member 244 about bolt 240 and relative to base member 238 tightening bolt 240 fixes the 34 fine 34 adjustment of mirror 272 about the axis of bolt 240 the pivotal position of mirror 272 about the axis of stem 266 which is perpendicular to the axis of bolt 240 may be adjusted by loosening one of the pair of set screws 280 282 and tightening the.