If you get an icecream container, the plastic ones that hold about a litre or two, look at the bottom and see if it has a little semi circular dent in it. If it does, eat the icecream first, and then you can use it under your sweep (the backdrop material that came with the tent) and position the paperweight any direction you like (pretty much, be aware then do slip sometimes...).
Very cheap and you get icecream too....