I bought my stands 2nd hand (Partington Broadside) and they came with attabites and spikes
prior to buying, I done a bit of research, and was told that one should only fill the stands 3/4 and not fully
also was told that I should avoid building or playsand sand etc ... as it will eventually corrode the stands from the inside (even if you place the sand in an oven to dry)
was mentioned that lead shot is very good, however, this is very expensive)
best is to mail the manufacturer and ask for their recomendations