Bill has given the best advice that I could.
One way to do It, but Have to be careful, and know when it's not a good idea to use one, is to heat the center of the weight bolt head with a soldering iron. You never want to heat anymore then what it takes to loosen the glue, and be quick with switching over to the screwdriver, hex drive, or whatever tool It takes to remove It, before the glue hardens back up. If the weight bolt is sticking out past the butt cap then you may be in better shape, but if the head is inside of the cue then you have more to worry about because the excess heat that the iron gives off can melt plastics or finishes, glues in the butt sleeve, etc.. Having a soldering iron that has variable temp settings may be better suited, so that you have the ability to have more control over The amount of heat You use.
Greg