Adapter: It is worth it having a cheap multimeter so that you can check if it is still providing voltage or not. If it isn't, usually its the tip that is broken and not the adapter itself... I bought a solderable tip and was able to quickly fix any problems with the tip if a wire broke off. There is also a link in this thread to a tip that doesn't need solder-- you just screw the wires on. No soldering needed. Replacement Screens: Pammy told me that the "holders" [retaining rings] were more like "training wheels" and that the screens are able to stay in place without them. My experience in not using them was that I was able to go a LOT longer without having to clean them, so I stopped using the rings (screens need to be large enough to firmly stay in place inside the tube). If you DO want the retaining rings, Pammy told me that they can be found at any auto parts store, ask for 1/4" (1/4 inch) size retaining rings. Example: http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_x_22144923-P_x_x The screens I got from Pammy looked like they were punched using a holepuncher such as you'd use for paper. If you don't want to get a holepuncher, just get large screens and carefully use a scissors to cut them to make your own.