Nighthawk,If you have to add a lot of weight in a small area you can use a product called "Mallory Metal"..Supply through any company that balances race car crankshafts...A piece 4 inchs long and an inch in dia weighs App 2 pounds..Drawback is price!!..JR..Jeff Rogers..ps..there is a new product used which i understand is called Copper Tungsten ,it's about 10 % heavier but i been out of the industry to long to have used it, does the same job though..