An article in which one should ever look closely at the instructions. If you then boldly goes to the point of installation works in seconds, and it fits perfectly. I was too timid and have rather then read again. On the second attempt, with a little more courage to leave gaps, it worked easily and exactly as described. I think that's five star value. Very good workmanship, perfect fit and high-quality optics round off the product. Strong buy recommendation!
