Sorry I didn't get back to this thread for awhile.
EZ answer, Bob -- try e-bay! Just type in "small bottle brushes" in the search box and you'll find hundreds of them! I put up a photo, below, of what I'm talking about. I've often snagged them out of the factory boxes of new pistols, especially foreign made pistols.
There are also lots of cotton swabs you can use, but I like these brushes dipped in kerosene and then dry the bore of the die with a regular cleaning patch on a pistol rod.
As for using kerosene, I became aware of it's many uses when I spent a year in gunsmithing school. Every bench had a gallon jug cut in half lengthwise to make a tub, and it was full of kerosene. The uses are too many to list, and once you start using it more will occur to you. The pluses are that it doesn't harm metal at all, is much safer to use than gasoline, and will leave a very thin, protective surface on the metal which is easily removed. The jugs had a coarse screen in the bottom through which any particles or sediment descended to the bottom below the screen, much like a car parts washer, and the liquid above the screen remained relatively clean. It was much used for hand polishing of metal parts (I did several refinish jobs on pistols) using successively fine grits of wet & dry sandpaper, and as the paper fouled with tiny metal particles it was dipped into the kerosene and swished around to clean it off. The kerosene acts as a lubricant also, washing away some of the particles from the actual area of the work. I believe that a large portion of the original Hoppe's No. 9 solvent is kerosene.
DG