Well! I gave this product the benefit of doubt as although one reviewer had said it was useless others had commented otherwise.
Now I feel a fool, six bricks later, after the first two in fact, this item started to bow at the sides and burst at the bottom, the design itself is sound but the materials are not fit for purpose, perhaps for someone of little strength it may be ok but if that is the case you would be wasting your time and would would do well just to burn the paper as it is, in order for any level of efficancy it needs good pressure.
Aside from the poor construction there is a safety issue stemming from the fact that the pressure arms slip of the runs causing the user to fall forward and in my case crush a finger.
Try another method as this fails on so many levels. I myself will add to the design to make it safe and usable, this may not be an option for many others.