A Dremel is a rotary tool that can be used to cut, sand or carve a variety of materials, including plastic, wood and metal. The head of the Dremel holds the blades in place. The Dremel is designed so users can easily remove the head and change the blade. There are many models of the Dremel tool; however, changing the head for all models is relatively the same.
Unplug the Dremel and turn it off. If the model you are using is battery powered, simply turn the tool off.
Hold down the shaft lock button on the operating end of the tool. This button is normally located on the front of the tool above the power switch.
Slide the allen wrench into the nut on the top of the Dremel and turn the nut to the left to open the housing holding the head. Release the shaft lock button and pull the head out of the Dremel tool. If the head does not slide out easily, press the shaft lock button again and unscrew the bolt until the head slides out.
Unscrew the top of the head and remove the blade from the shaft.
Select a new blade to use on the head. Dremel blades have four different sized holes for the blades. Make sure the blade's hole is the correct size for the head. Slide the blade onto the head and screw the top piece back onto the head. Tighten the head so that the blade does not move in any way. If the blade is not tight enough, it will shake and wobble, causing the Dremel to malfunction.
Insert the bottom of the head into the housing in the top of the Dremel tool. Screw in the nut you unscrewed earlier to tighten the housing around the head. Tighten the nut as much as possible. This ensures the head is correctly mounted in the tool.
Press the shaft lock button to keep the nut from being turned while in use.