[Bassnut (Fred)]

Originally Posted by jeff65

Thanks for the replies.

Yes, the physics jibes with what I remember from school, but I thought sand filling was recommended because it gave a damping effect. If I'm getting any damping benefit it must be more than negated by the mass increase.

The sand has to go! I wonder why it is so commonly recommended?

Thanks again.

Add cement, wet it, and turn it into stiff concrete .