Clean it thoroughly and it will fix your problem If you require a new screen for your shaver, you will find at. Then brush it all out with an old toothbrush or similar. You may need to use a toothpick or similar object to loosen and remove the build-up in the crevices. Remove the cutters so that you can access it properly. You will need to thoroughly clean the top of the shaver body. 1614 Answers SOURCE: If the shaver heads pops up, this is because you have not cleaned it properly.If you have taken your Wahl clipper apart for cleaning and was confused as how the four pieces go back together here is a little video, sorry for the focus. Battery powered mustache and beard trimmer with a 5 position guide an 3 standard guide combs.