Lead shot or sand (speaker stand filler)

[J_C_COOL]

Am trying to fill my stands with ballast as the new 4 pawed arrival in our house keeps knocking them over. (it's surprising how fast you move when your speaker is heading towards your TV at an alarming rate)and was looking at my stands and reckon that sand is going to be tricky 'cos it might seep out the bottom but I want everyones opinion as to which is best and where on earth to get lead shot.
Cheers
(am in manchester if anyone has local knowledge for local people)

 

[Cable Monkey]

Bin liners are excellent at preventing sand from spilling everywhere.

 

[J_C_COOL]

An excellent idea, but it didn't work. The vertical tubes which the sand is going in have a bit going across for attachment to top plate/base. So I used a little of that crazy expanding foam stuff that buliders use for blocking holes/insulating to block the bottoms and then just added sand. hey presto weighted stands!!!!!
Cheers