If you've every owned one of these things you'll know that the suction of the vacuum leaves much to be desired. Also a problem with these units are the rechargeable battery packs. The packs themselves (which the company will tell you that they aren't replaceable---but you can rebuild them yourself for under $20) are probably okay, but the the charging system is just a 9v power transformer that trickle charges the batteries. If a person leaves this on the charger constantly they'll eventually kill the battery with overcharging.
I did contemplate finding a dead 12v drill and rigging the battery holder from it to this unit. Step down the power to 7.2v and it'd be a pretty nice set up. But no. I went nuts.
I took radical measures to bypass the bad suction and battery issue after the batteries in mine kicked the bucket.
Step 1: Poor Dead Thing
Here is the patient laying in the operating theater, practically lifeless.
Step 2: What's What
The first picture is the motor and battery assembly. In case you want to resurrect your unit you can order 6 sub-c NiCd batteries. 1.2v each and 1600ma or higher. It'd be interesting to see someone replace them with a lithium pack.
But that doesn't interest me. It's time for amputation.
Step 3: Radical Amputation
Oh the horror! Take a hacksaw or whatever cutter you have to that thing.
Step 4: Oh, My God! You Are Not!
Yes, yes, I am. If you don't know what the black thing is in the picture, it's an adapter to Shop Vac. OH YEAH!
Step 5: Prepare For The Transplant
Once again use the hacksaw. Lop off the end piece as shown. It would have been great if the hose on the Swiffer was just a little larger, but I didn't get lucky this time. Saw off the piece, use a little adhesive (more for making an air tight seal than support), and use screws removed from the Swiffer's body to attach the unit. You'll have to pre-drill the holes with a bit a twinge smaller than the screws. I think mine was a 1/8".