I'd recommend using a dremmel tool and cutting your own sanding disc to use from sand paper. If you don't have a dremmel tool you can usually find one for $30 and then the cost of sandpaper. You have a wide variety of grit to choose from and if you have a poker chip or a 50 cent piece it is perfect for tracing the disc size needed.
My brother has a wood dowel that he wrapped some sand paper around and you can just hold it in place with your fingers as you use it or with some tape. If you wrap the sand paper a little tight tape will hold it in place perfectly. It works the same as the tool listed, but the dremmel is more proffered and consistent. As listed the other option of folding some sandpaper a few times and using your finger works really well. I always come some in my bag for bowling just in case for that very reason. Usually one kinds course grit and one smoother grit. Hope that helps.
Be good, or be good at it.
Edited by kidlost2000 on 5/14/2011 at 5:22 PM