"News of this neat little item now for sale was sent to us by a follower. You can buy this locking ring for your analog meter by contacting:"

"Economy Lock and Key (707) 579-3183"

"We can’t guarantee your results, but it looks sturdy."

http://stopsmartmeters.org/2011/10/05/defend-your-analog-meter-part-v/

More ideas for defending your analog:

http://stopsmartmeters.org/2011/03/01/defend-your-analog-meter/
http://stopsmartmeters.org/2011/04/28/defend-your-analog-meter-part-ii/
http://stopsmartmeters.org/2011/05/11/defend-your-analog-meter-part-iii/
http://stopsmartmeters.org/2011/08/15/defend-your-analog-meter-part-iv/