Sand and shot?


This question is really for what most bookshelf speakers sit on--the stand. I'm planning on filling a set of stands(24") but just have the sand presently. Do I really need lead shot as well or will the sand be enough. Most reviews I read on speakers mention stands with both. Any help would be most appreciated.
south43
I used a mixture of sand and shot by filing first with sand and then pouring in the lead.
You can get blu tac or 3m substitute at any hardware or general merchandise store.
Once again I thank you for your knowledge and advice. I called a gun shop to inquire about the shot and was told Walmart has this. Maybe I can get the blu tac at the same time. I'm on my wayyyy :)
Post removed 
I had no luck find blu tack at Walmart. Elizabeth where can I find the generic blu tack you mentioned? My quest continues.