Well this is real easy, get a 1/4 in rope or close. Next put the rubber on the glass on a workbench or the floor, then soak the rope, next center the rope in the grove of the rubber at the top of the gasket and push it in the gasket all the way around on both sides until the ropes meet again in the middle at the bottom. I like to wet the outside of the frame and gasket with a little soapy water in a spray bottle. Now get a freind and set the window in the frame with the ropes on the inside. Having the freind hold the glass up from the outside with a little pressure on the glass where the ropes are, Pull up on both the ropes at the same time Just a little and the rubber will pop up and over the frame, Then with just one rope pull it up slowly having pressure against the glass as the rope moves along the bottom. Go ahead and do this all the way around, you will have to work it slowly in the corners. When you have roped it all the way around and the rubber has transfered to the inside of the frame if it is still not seated flat in the frame in areas then you hit the glass with a FLAT HAND on the area that needs to seat. Wholla Your done.