Thanks mxr dad. You are second in line. I also have the Btech mounts as well. I really don't have an answer for that. I do remember when I had my mounts (although a different brand), they clamped down very tightly. As mentioned, you could drill a hole in the bottom of the mount so that you can secure the speaker through the threaded inserts (if they have them on the bottom). Hi Randy, James and Dad have expressed interest in buying the Pinpoint AM40. The BT77 are still available.
Thank you for all you're help, I will take the AM40's. PM me when you're ready and I'll send the $$ your way.
Thanks again for everybody's help, this is probably the first message board that offers such a warm welcome for users!!