I forgot about them, until just now you mentioned them, when i was around 12 or 13 I remember the red ones and blue ones. they were for sale at the county fair. they were spring loaded things so you colud use them like a regular cue or(this is where it gets good...) you could turn the ferel a half turn and it would release there was a 6" long stem that went into the shaft that was spring loaded so when you just tapped the CB the spring would let go and the tip would be pushed out by the spring and "enhance" the power of the shot.
Sorry for the bad description but i'm real busy right now, and that was along time ago-no i didnt get one.