Although we have not done what your asking, we have heard that the weight is installed with a some adhesive and possibly a small rubber piece that is around the weight and when the weight is forced into the shaft, the weight is secure. If adhesive is used, you can try and heat the butt end f the shaft very slowly in an attempt to break the adhesive bond. Obviously this is risky since the shaft is composite. That being said, it should not take much heat to break it loose. As for the extension size, we have no idea. Also, once you do extend it, it is doubtful the weight would fit into the extension. Again, we have not done this, so we there could be options that we are not aware of.