Hi Bob, Firstly thank you for taking the time to write your detailed review. We take our customer feedback very seriously, and appreciate it especially when it is constructive! After reviewing your concerns, I had my technical support team compare them with our instructions. We came to the conclusion that our instructions need to be improved regarding concrete wall installations. We should have specified that the 1 1/2' panhead screws required for installation to a furring strip be self-tapping so that they could puncture the aluminum inserts. I apologize for the inconvenience this caused you. By the way, using painter's tape to hold the trim in place while fastening it to the wall is a great idea, especially when installing alone. I will contact you privately via email as well as a secondary follow up. Once again thank you for taking the time to leave us this review, it will certainly help us improve! Best,