Michael Daly wrote:

On 21-Mar-2004, Stephen Bird wrote:

Wow... now that is what I'd call observant! :-) I wonder if foam
insulation (which is sprayed and expands on use) would work? Is the
purpose of the sand simply to fill the hollow part of the bar?

If you want to kill vibration, mass and damping is the way to do it.
Sand has mass and is very inelastic, therefore it will provide some
energy absorption. Lloyd did the right thing.

Foam would be too light and would contribute almost nothing to the
bar.

Mike

The expanding foam would stick to the inside of the tube and become
rigid. This should stop the vibration. And would be much lighter then
sand.

--
Gordon Niessen
If you aren't on the bleeding edge, you are history.