includes two tabs 39 disposed on a side edge of the plug 3 the two tabs 39 extend from the rear portion 35 a distance approximately equal to the width of the side sash wall 41 bend at approximately a 90 u00b0 angle and run parallel to the rear portion 35 of the plug 3 the interior 42 of the back section 37 of the plug 3 is hollow the two tabs 39 maintain the plug 3 in its insertion position in the opening 5 in the side sash wall 41 in fig3 b there is shown a frontal view of the frame ramp of fig1 the frame ramp 1 in the form of a plug 3 has a rectangular shape with the upper end 6 disposed at the top of the side frame 9 of the window 11 and the lower end 4 disposed at the bottom of the side frame 9 of the window 11 the side frame 9 of the window 11 includes a slot 43 having a length slightly exceeding the distance between the ends of the two tabs 39 the slot 43 narrows in the direction of the opening 5 and is notched to provide an engaging edge to prevent movement of the plug 3 toward the slot 43 after being moved into the opening 5 turning now to fig4 there is shown the window frame of fig2 with an expanded side channel the frame 51 of the window 11 includes side portions 53 only one shown that each.