I know that this may be redundant or may have been answered before, but I just bought some banana plugs (monster brand) to use with my speaker cable (standard monster 12 guage). I'd like to know how to connect them. There are no directions on the package, and obviously slipping the copper in to the little hole doesn't result in a tight fit. The wire just slides right out. I've seen some talk of heat shrink tubing, but is that enough? Would the tubing keep the wire from sliding out, or do I need to do something else. Any advice would be appreciated. Thanks.