For the 3M 28547 Pistol Grip Disc Sander, detailed disassembly and parts replacement instructions are typically provided in the user manual or repair guide that accompanies the tool. If you do not have the manual, you can often find it on 3M’s website in the support or product resources sections. Here are some general steps to consider: Disconnect Power: Ensure the sander is disconnected from the air supply. Remove the Disc: Detach the sanding disc from the sander. Access the Motor and Components: Use the appropriate tools to remove the casing screws to access internal parts, such as bearings, gears, and motor components. Replace Parts as Needed: Replace any worn or damaged parts with official 3M replacement parts, as using other parts may affect performance or void the warranty. Reassemble: Reverse the steps for reassembly, ensuring all parts are properly aligned and secure.