I'm having some decent success using plumbers putty inside my Radicals to get the weight up a bit. It is easier and more precise than silicon and seems to stay in place better than fishing weights that somehow vibrate out of their cotton ball cocoons after awhile. It's a bit of a hassle but can be reversed. I'm doing a similar process as other methods by flooding the handle with cotton balls and I'm putting my putty just above where I grip then back fill the rest with cotton balls. Anyone else tried this?