Lead roof flashing can be had at the hardware store for cheap and is thin and can be cut with normal scissors.Also two sided carpet tape can be had at the same place .It's thin as well and if needed you can double it up for a slightly irregular surface.Cheap and easy to handle system for balancing any cast rubber tire/wheel and since it's thinner than tape a weights you can use a larger patch of it of the same weight and it will stay in place longer

Hope this helps

Peace [8D]