mounting a satellite onto stairway railing


Hey need some ideas on how to do this. After finally deciding to keep my sonus faber concertino's as surrounds I need to mount one of them on my steel stairway railing to put it out of the way.

I was wondering if anyone has any easy solution for some kind of clamp that would attach to a vertical steel bar and also attach to a platform which I can put my speaker on.

Ideally I would like the platform to be able to have some holes in the bottom so I can screw and secure the speaker by the holes preplaced in the bottom of the speaker.

Thanks
oogs18
We in the film business would suggest what is called a Mafer Clamp. It is designed to clamp onto something just like that. Add a Spud adapter and you can mount anything to it. Look at this:
http://www.filmtools.com/suma484moand.html.
Google "mafer clamp" and you'll find other stuff as well. Look for Matthews Studio Equipment also. Good luck.
great idea. looks like with the selection of clamps i'll be able to find something that'll work well

thanks
follow up question. is there a standard size bolt for the threads in the bottom of my speaker? wondering what I need to buy.