the sheet and a sealer circumscribing an outer periphery of the insert and a method of manufacture including the steps of removing the first sheet from the insert replacing the first sheet with a new sheet tensioning the new sheet and placing the insert into the window frame application_number US 65419703 A description the frame insert assembly 10 has an insert 12 for fitment within a frame 14 the frame 14 may be typically an existing window mounted in an existing wall of a building the frame 14 is conventional in construction and may include trim molding 20 mounted to the jams 22 of the frame 14 the frame 14 may have a movable sash 24 or perhaps as illustrated a double hung window having two movable sashes 24 as is conventional the frame 14 has a head jam 22 1 two side jams 22 2 and a base jam or stool 22 3 the insert 12 has a frame 30 with rails 32 including side rails 32 1 a top rail 32 2 and a bottom rail 32 3 at the junction of any two rails 32 there is a corner 34 the corner 34 serves the function of connecting and locating a pair of adjacent rails 32 each rail 32 is attached at each respective end to a corner 34 using a suitable mechanism the respective rails 32 and corners 34 should have substantially the same outer dimension so that the junction between a rail 32 and a corner 34 is.