Filling speaker Stands?


I have a modest system. Continually look for ways to improve it's performance even to a slight degree. I have read many posts about improvements than can be achieved by filling the hollow spaces of some speaker stands with some type of material....sand, kitty litter, lead shot, and some others. Here are the stands I have......
https://www.sanus.com/en_US/products/speaker-stands/sf26/ 
These stands are of metal construction. There are 2 upright support tubes which are approx. 2" diameter. The stands sit on a carpet floor with spikes. On the top plates are a layer of Sorbothane and PSB Imagine B speakers sit on top of that. The 2 metal supports are attached to the base and top plate with just threaded holes about 1/4 " diameter. Pouring some type of dampening  material would definitely require a funnel.
The reason I ask this question is that, when I thump on each upright post, it rings for several seconds. A dampening fill would minimize this but would filling those posts really benefit the speaker performance to even a small degree given my modest setup? I don't know. Probably, few have experimented with this type of scenario.Thanks for any advice.



jrpnde
Sand is the easiest to get through small openings. It is heavy and inert. Lead? Don’t bother. You are looking for speaker stands that don’t resonate, not speaker stands that The Hulk couldn’t pick up.
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You don't need it to be heavy, you just need it to stop ringing. Sand does a good job.
dill...I like your suggestion. Haven't been to Home Depot to check out the options but I do have a question....... Like I mentioned, the access from either end of the 2 upright tube supports are small threaded holes probably not more than 1/4" in diameter. Are these "small pebbles" small enough to fit thru such small holes?Thanks for your advice.
If you use sand, only use stands that are welded, stands that have bases or parts that are screwed or bolted together might cause sifting in the cracks.