I bought one of these and they work perfect. stays attached to your headphone cord so you wont misplace it....
http://www.binder-usa.com/?ACT=36&entry_id=2888
they also have the cap screw for the connection on the detector if you want a spare....
http://www.binder-usa.com/?ACT=36&entry_id=4127
http://www.binder-usa.com/?ACT=36&entry_id=2888
they also have the cap screw for the connection on the detector if you want a spare....
http://www.binder-usa.com/?ACT=36&entry_id=4127