The adapter setup on my Discovery II works very nicely. It plugs into the existing power cord receptacle and has two receptacles on top. The one on the right, directly above the machine's power receptacle is un-switched for the power cord and the one on the left is switched for the Sidekick. You can actually turn the switch on the adapter to the 'on' position and then run the Sidekick with the vacuum cleaner turned off, not that there would be any real reason to do so.
On my Genesis LXe, the receptacle for the Sidekick is where the power cord would plug in on the Discovery.
