Maxgain,
While I have no experience with your setup or decoupling the speakers from the floor, I do have a lot of experience with bolts/nuts that loosen. I would find what is referred to as a nylock assembly. Most people have seen the nylock nuts but not the bolts. For those of you that aren't familiar with this type of fastener, it has nylon intergral with the thread and really holds even if you don't tighten the bolt or nut. Most large cities have a fastener specialty outlet. I would recommend taking one of your bolts with you to such a store and buying enough to replace the bolts you are now using.
My hotrod would simply vibrate apart without these wonderful products.
While I have no experience with your setup or decoupling the speakers from the floor, I do have a lot of experience with bolts/nuts that loosen. I would find what is referred to as a nylock assembly. Most people have seen the nylock nuts but not the bolts. For those of you that aren't familiar with this type of fastener, it has nylon intergral with the thread and really holds even if you don't tighten the bolt or nut. Most large cities have a fastener specialty outlet. I would recommend taking one of your bolts with you to such a store and buying enough to replace the bolts you are now using.
My hotrod would simply vibrate apart without these wonderful products.