Blu-Tack is an adhesive putty that works quite well, it makes a strong bond but won't wreck the finish of the speaker. I'd prefer lead shot to fill the stands mainly because it is less messy. Hope this helps.
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I use 20 lbs. of steel shot in each of my Lovans. I bought the shot through an ammunition dealer. Also, since I'm an artist I've been using 4 pieces of kneaded erasers under each speaker to good effect. The kneaded erasers come in flat squares that can be cut or molded into any shape like Silly Putty. I just roll em up into little gray snotballs and place them under the 4 corners of my speakers. The weight of the speakers compress the balls into flattened discs. It works pretty good for me. A cheap home fix. Also, they don't mark up the cabinet finish one bit.