We use the window openers for our balcony-cold frame, (60x100cm) - fits very well in with the compact cylinder and works perfectly. We have an additional support of 15 x 15 mm plastic profile fitted squarely because the entire weight of the opener and the raised lid otherwise attached to the thin plastic wall sheets and the thin aluminum profiles. The holes are already there, just a nail or cotter pin mount, running. The cover I have not screwed, as with us on the balcony not so much wind that the lid could mess. So I can completely open the lid for casting. (Or make photos :-)). Who does not have two left hands is well advised with the product. A star deduction is available for the in other reviews mentioned lack of sufficient guidance.
