Sorry but what do you mean by that? If I put a post in there, what am I supposed to screw with? Screwing is done by inserting an iron rod horizontally into the holes of the U profile. If there is a post in there, the holes are closed.
Sorry, but what do you mean by that? If I place a post in there, what am I supposed to screw with? Screwing is done by inserting an iron rod horizontally into the holes of the U profile. If there is a post inside, the holes are blocked.
The post goes crosswise into the U, then the level on top, then rotate with the post.
The screwing is done by inserting an iron rod horizontally into the holes of the U profile. If there is a post in there, the holes are blocked.
Drill a piece of post crosswise with 12mm,
if your screw rod has a diameter of 12mm, and use it to screw in the post anchor.
Since the anchors rarely align, regularly check with a spirit level.