For keyhole type speakers: what if keyhole is too small for special nut?
This response, and instructions, talk of "special nut" that fits in keyhole speakers.
"Yes, according to the directions there is a special nut that slides in the key hole then the mount itself with a spacer and the screw. The screw will tighten in the nut clamping the mount between the key hole and the mount itself."
However on my speakers the keyhole too small for the nut and hardware stores do not have a solution.