Quote Originally Posted by kiwi girl View Post
when you say square is it more like a small Allen screw. From the description I think that's what you mean. You can use it to adjust the tension of the clips - and the red is the indicator of how much tension you have
I know where the Allen screw is as I've tried adjusting them to their loosest setting. I did think the little square at the back was some kind of indicator. I adjusted the settings both ways, first to their maximum setting (no movement on the little indicator at the back - showing half red) then to their minimum setting (little indicator didn't move).

I'll have another go at them tomorrow but I don't think I'll like this particular type.