Small 2.1 mm power jacks

[electrosonic]

I can not find a small jack that is insulated from the case and switching  and that mounts in a round hole . I have the some that fit in an 8mm hole (~5/16th) but they are not switching. I have looked at the Small Bear site and a couple of local shops but haven't found any. Anyone know where if they are available in this size?

Andrew M.