Its so annoying to find Roomba after he's finished cleanin only to see that once again he's lost his brush. How to keep your Roomba from losing his brush- items needed: quick steel putty (local hardware store), crazy glue, original screw (or similar), toothpick, and screwdriver. It seems to be that Roomba loses his brush because the threading in the plastic insert the screw goes attached to gets worn-out, so even when you put the screw back in it'll eventually fall out while he's working. Begin by cutting off a very tiny piece of the putty (follow instructions on package) and stick that into the screw hole. Now that it's filled up, use the toothpick to create a hole inside the plastic screw hole where the screw normally fits. You go will windup taking most of the filler material out as the final fix winds up using very little putty. Let the putty dry per the manufacturer instructions. Once it is dry use the screw to create the new threading in the steel putty. Do this by screwing the screw into the insert slowly backing it in and backing it out a little at a time. Try not to wobble the screw as you do this. Once you get a good fit take the screw back out, now it's time to put the brush back in. Put in a couple of drops of crazy glue in the hole and put the brush and screw back in. Let it dry for at least overnight just to be sure. And that's it! If you're not very hands-on it might be better to let somebody else do it for you, you don't want to get the steel putty or crazy glue into any of the moving parts and then ruin the assembly.