After 3 attempts, the crane arrived and lifted the final large windows into place. Yes, that is an attachment with 8 suction cups that lifted the windows. All went well until the clouds rolled in and the wind came up, causing the large windows to vibrate and sway as they were hoisted along the north side of the house. It was no small feat to place these 300+ lbs windows in their holes, even with the crane. But, the finished product is beautiful.