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
Mickey Mouse is a nice character with numerous virtues. He is also a fine gentleman who is, if I remember correctly, turning 90 this year. Which brings me back to elizabeth’s recommendation not to use lead because of toddlers. Has nothing to do with sound, but a lot to do with this thread. Unless you are sure you will never have a child visiting, do not do it.
Well....I am the OP of this thread. There have been many suggestions as to how to fill stands with small openings, what that fill should be, and to what level of fullness should be. I have learned a lot based on the experiences of many.My take on all of the responses......the only way to find the best solution for me is to try different approaches. Of course, filling speaker stands isn't as simple as trying other options such as just switching interconnect cables and the like.
The forums here often stray from the original question or comment of the original poster. I have read many posts that did so and, sometimes, I read something I didn't know that would be in there but provided valuable information for me.I know this audio hobby is VERY subjective. Everybody has different equipment, musical tastes, and EARS. That's what makes this so interesting. Criticizing others for their opinions may just be a bit outside of what the forums try to achieve.But, we're all human and want express ourselves in whatever manner.Thanks to all.
jrpnde,

Thanks for this thread. It was informative to read different solutions and thoughts. Hopefully, you got your answer. Enjoy.
@glupson - My sincere apologies re Mickey, I should not have besmirched his impeccable gentlemanly  reputation by association with GK.