Do you people not think? Weight is not his problem, balance is. Adding a pound of lead at the CG won't do a damn thing for him. He either needs to remove some weight in the tail or add some weight in the nose. The battery under the engine mount trick seems like a good idea. Or, and this is rather radical, tear the covering off the tail feathers and remove some weight there.

One big problem is getting theenvironmentalists up in arms about using lead as a weight, if you can even find it.