Saltec Thumb Caster
Here is a very good little gadget called the Saltec Thumb Caster. You tape it to your fishing rod opposite your eggbeater reel so that the little alloy knob is facing the other way from the reel. Before you cast you wrap your line around it. Then when you cast you simply release the lever by lifting your thumb from it.
Take it from me this thing really works. It is essential if you want to spool your eggbeater reel with ultra thin super braid line and use it for casting. I have used it quite a bit. It works just as well with monofilament lines.