I lay a lot of paving on screeded sharp sand beds, and ive had a good look around at some of the products avaliable to make it easier to do rather than being on your hands and knees with a piece of timber (i want something a bit more durable and accurate). Has anyone tried the probst system or made up their own version? I was thinking along the lines of a length of angled metal, with a handle attached to it, to drag it by and a weight over the bar. (basically a copy of their system, but bit more basic)