Installation Page 3:

3 - Place light pencil marks on the screen side of your host screen where the top edge and outside edge of your pet screen meet the frame of your host screen
(See Figure 3 ).

4 - Locate the position where the spline grooves of the pet screen meet at the top outside corner of the pet screen.

5 - While keeping a fix on this location, remove the pet screen and with razor blade provided, cut host screen material from this location (intersection of Top Outside Corner & Spline Groove). Cut from (A to C)
See Figure 3.

6 - Locate pencil marks on the side and bottom of host screen (Both B's), then with razor blade provided cut host screen material (as close as possible to host frame) from both (B's to C). See Figure 3

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Figure 3