Needs 2 people to assemble, but once together and fully tightened does the job extremely well.
It needed re-tightening after a couple of days and the block at the foot end needed to be reversed to prevent the slat from sliding under it. No 45 degree edge on the diagrams, but there was on the block. There are recessed holes in the block which looked an obvious way to attach, but this caused the issue.
Photo is of the re-positioned block