after much testing I found iron shafts that work well for me , Aldila NV 95-stiff. My only complaint is that they feel a bit light in the wedges due to the decending weights. I had an idea to push the GolfWorks corks down to the balance point of the shaft, add tungsten powder, then another cork on top to seal it. I already tried the first cork and managed to push it down to 17 inches below the butt end, very close to the balance point. Is this a good option to add weight or will it affect performance in some way?