I sent Him a PM letting him know about your post here. Hopefully He will chime in, and help you guys out with what he knows. He's a pretty good guy, so I'm sure he will tell you what he knows of. I've been thinking, and the forward balance will probably be more forward, due to where they will be grabbing the extension toward the back, having too much might would be an issue if one. Also weight, if building the whole cue w/extension from scratch, steps could be taken to make the whole package work together better, but making just an extension is going to add weight no matter how one goes about it IMO. the question is how much to take out of an extension. coring could reduce weight, but I tend to think this would effect the hit, and possibly bring on a vibration in some cases. therefore if It were me, I believe I would rather deal with the weight. But then again the cues I have been doing recently, I am more focused on balance being right where I want it anyway, then trying to achieve a specific weight. Weight only makes so much of a difference for me ajusting to a cue, not much at all really, the balance, and how crisp the hit is, are where I can have issues ajusting it seems. Usually if there is something that I need to change afterwards, It would be in the ferrule material, or tip to match the cues hit best. I want a cue to be kind of crisp feeling and put spin on the ball with minimal effort, but not so much so, that It won't hold that fine straight line on the object ball, and send It flying all over the place. can be tricky to achieve just the right amount of balance between these characteristics as well. This is how I am though, and I am trying to think as if in these guys shoes, as to how any of this would be to them. Pushing from the back of the cue, has to change things alittle in these areas I would think. or if the cue tends to jerk even the slightest bit when they stroke through. If that were the case then I would think less action would be better instead. Alot to think about to get the best performance for them IMO. still in deep thought about this one. Greg