The first thing you need to know is that drum sanders will differ, so you’ll want to refer to your manual or any other resources before you begin the change. However, most sanders will have a lid that you can pop open in order to change the abrasive. From here, you need to remove your first strip of abrasive and prepare your new one. Generally, you’re going to need to unroll your new sandpaper, making sure that it is cut to the required specifications, then you need to is to insert the beginning of your sandpaper into the clamping device. Make sure that your sandpaper fills as much of the slot as possible while making sure that it aligns tightly to the edge of the drum. Ensure that it’s fastened by tugging on it, and from here you’ll be able to slowly wrap it around your drum.  Make sure you cover the drum and that there aren’t too big gaps, pulling the sandpaper tight with one hand and rolling the drum away from you with the other. Once you get to the end, insert the sandpaper into the clamping device on the other end and fasten it as you did before. Some clamping devices use a spring-loaded mechanism, so you’re going to want to make sure it’s attached before starting your machine up.