Does this help?
http://www.oregondv.com/spikes.htm
or
http://herbiesaudiolab.net/spkrfeet.htm
scroll down to "threaded stud glider"
All the best,
Nonoise
http://www.oregondv.com/spikes.htm
or
http://herbiesaudiolab.net/spkrfeet.htm
scroll down to "threaded stud glider"
All the best,
Nonoise