I generally hollow out the neck and fill it with helium. The problem is, helium is one slippery molecule and hard to contain. If that doesn't help enough, solid gold or lead hardware on the body should do the trick.
It should be done scientifically though; too much compensation and you will end up with the opposite condition; "Body Droop". I think that was Bill Wyman's problem. Oh, and be careful who you tell about it, if word gets out that you know how to fix Body Droop, the middle aged women will hound you to death. Don't ask how I know.
Tom
10/10 would read again!
