Mounting a bookshelf speaker on the wall

Polk Audo Monitor 30 series weights about 10 pounds each. I got the Omni-mount at $30 a piece but after I attached them to the wall and secured the speaker to it, I don't think it will hold. The mount is plastic with a lot of connecting pieces held together by allen screws in compression, and a single screw holds the speaker through the key hole in the rear of the speaker. As I adjust the speaker the plastic parts yields a little, I think with the vibration it will not be long before it fails.
I was thinking, there is only one keyhole in the rear of the speaker, so it was meant to be mounted with a single screw. I can get more sturdy mounts in the $50 a piece range that looks like a tray but I really want to conceal the mount as much as possible. Why can't I just get a hanger bolt and screws one end into the wood stud and the other end with a cut that holds the speaker and not use any mount?
Any suggestions?
MC
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I would forget the Omni-mount. I like your idea, and suspect that a slightly backed-out sheetrock anchor would be a bit wobbly for 10 lbs.. First, locate the studs and see if their locations are decoratively ok for the speakers. Then, take one speaker to the hardware store and find out what head-type (could be a flathead, panhead, or roundhead) and length of wood screw you need to reach 1 1/2 inches into the stud, thru the sheetrock, and still protrude far enuf into the room to fully engage the keyhole on the speaker back. Then do your pilot hole and set the screw so it protrudes *just* enuf (it'll take several iterations) to wedge the speaker against the wall, with almost no play, once the speaker is fully down on the screwhead..
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That's exactly what I do. I use an anchor bolt in sheetrock, then unscrew the screw enough so the speaker hangs on it. Been that way for 10 years with no problems.
Dave
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