First time using this type of head and I was very satisfied, it doesn't take a 4mm square that I tried to put, but even with the 3mm it's fine. If it breaks, I will buy it again.

Put double cement in one hole of the head and nothing in the other hole and cut strands. Also, the metal rod goes in first and then the cements go in.

Quality accessory, a little difficult to open and close but we will get used to it. In the first test, I lost a screw, but it was probably my fault. After that, it worked normally, in combination with an aluminum screw, I also bought another screw head. Below is the review and test, I will come back if anything changes - https://www.youtube.com/watch?v=9f8TdEuM3jM