This is probably a no-brainer for all of you, but I'm running into a problem getting my fixtures to hang straight down from a goal post.
As you can see in the pictures below, the stage clamp which started out perfectly vertical, has slipped around the speedrail as I jostled the goal posts raising and lowering them.
I've also tried cardellini clamps of various types to no avail. The speedrail is clamped firmly into the combo stands.
So, it's probably obvious, but is there some sort of clamp that will hold a baby pin vertically and not slip around the rail?