fig8 illustrates the retractable pin 518 engaged with the detent d whereat in this position draw bar 512 is locked and restricted from any movement by operation of the latch operator 514 and retracting the pin 518 as shown in position i the homeowner may pull the draw bar handle 513 to permit the roll out screen to extend from the screen cassette subsequently the latch operator 514 may be released resulting in the retractable pin 518 engaging with one of the multiple detents d then preventing any further movement of the draw bar until the further operation of the latch operator 514 referring now to fig9 and 10 there is illustrated the single casement window 520 that includes an outer frame which consists of header 521 and sill 522 right jamb 523 and left jamb 524 further the assembly includes a sash contained within the outer frame including frame members 527 528 529 and 530 the sash includes a sash locking device 526 left jamb 524 include a pocket p containing screen cassette 531 which carries a bug screen s while the right jamb 521 has a pocket that contains a blind cassette 531 u2032 both the header 521 and the sill 522 include tracks t that allow motion of rollout screen blind horizontally from the left jamb to right and also from right jamb to the left the tracks t.