Question

I'm actually doing a project but I don't know how easy it will be to describe it. It involves two weights, both attatched to the same string through the center of a flat surface so one weight is directly on the surface, and the other is dangling below. What the intention is, is that when the weight on the surface is flicked, the one dangling does not bobble or move. Therefore the dangling weight cannot be too light. We need to use everyday items, but I'm just not too sure what the correct weights would be. I understand completely if no one can help me, as this isn't really a question. But thanks if anyone can.