They both fit in the space between the outside stop, called the blind stop, and the removable interior stop (see Fig.
Measure all the way to the jamb, not the blind stop or parting stop (see Fig.
Then remove it and lay a bead of polyurethane caulk along the inside of the blind stop and the backside of the window stool.
3 REST the bottom of the replacement window on the sill and tilt the window into place against the blind stop. If your window includes a head expander, position it over the top of the jamb first, Press the window tight against the caulked blind stop.
9 CAULK the joint between the new window and the blind stop and between the windowsill and filler strip.
space between the clip and the blind stop or the jamb liner won't snap in (Photo 5).