Monitors secure on stands

I used heavy duty velcro from Home depot. Never had a problem,
even when I decided to sell the speakers, the velcro peeled off the bottom of the speakers without issue.

I called our local Lowe's and craft/ art stores and none have Blue Tack. They have other brands of what sounds like the same type of material. Sound okay?

Absolutley, there are many alternate brands of "Tac", any of them would be fine.

I wouldn't use Blu-Tak. I've heard they can discolor and harm the finish of a speaker's hardwood veneer.

Over the years, I've used artists's kneaded erasers to fasten monitors to metal stands. They are maliable, gray erasers kind of like Silly Putty that can be shaped, stretched or compressed into any shape. One eraser can be sectioned into four pieces, enough for one speaker, then you just roll each piece up like a semi-dry snot and place it near each of the corners of the monitor. When the speaker is placed on them they flatten out like little gray pancakes and secure the speakers ot the stand. The erasers contain a fine powder in them that prevents them from drying out and hardening for literally decades, and this powder also prevents the them from ever becoming sticky or gooey. I have kneaded erasers from the mid 1970s scattered throughout my art supplies that are still completely usable. Just pull and stretch them for a few seconds and they become clean and maliable like brand new erasers.

For years I've used them to attach ProAc and Sonus Faber monitors to shot-filled stands and they hold the speakers very securely. With the stands filled they can weigh almost 40 pounds, but even when I've accidentally hit the speakers, they didn't fall off or come unattached. The whole unit speaker and stand just wobbled a bit. It was as if the stand and speaker was a single unit! After a few years when it came time to remove the speakers from the stands it took some careful rocking and prying, but they came off and the rosewood finish was absolutely perfect! There were a few rogue boogers here and there, but they clean up very easily and you're left with a perfectly clean hardwood finish.

Just about any art store will carry them and they come packaged like large gray butter pads wrapped in plastic. I think they are the best choice because they firmly secure the speaker to the stand and when removed leave no trace at all. The only thing more secure is screwing the speaker to the stand. Have a look.

http://www.dickblick.com/zz215/02/

I attach my Europas to the Osiris stands with blu-tack. You can actually grab the top of the speaker and the whole speaker/stand combo tips. Very secure. Of course with the Europas I dont have to worry about veneer!
Valinar, look for the yellow stuff by 3M. I think even Wal Mart carries it. I have never seen Blu-tack locally, I ordered mine online.