hello guys,

I am going to be placing some sierras on my rear walls that already hold my older 170's for surround duty. As you know the B-Tech Bt77's http://www.crutchfield.com/p_121BT77...owAll=N&tp=586
only "pinch" the speaker with the side clamps. I am afraid this is not enough to hold the sierras in place especially if they were bumped hard enough.

what have others done to secure them better with these mounts without harming the cabinet? I love these mounts and they worked great for the 170's but the sierras are much larger/heavier.

Thanks,

Brandon