Dremel 4000 Back Case Replacement

Start by removing the housing cap by unscrewing it.

Next, unscrew the now exposed collet nut while holding down the shaft lock button.

Using your hands, carefully remove hanger from casing.

Remove the brush caps (one on each side) by using a flathead screwdriver bit.

Using the Torx 15 screwdriver tip, remove the 5 screws (12.5 mm) that hold the casing together.

Use a plastic opening tool to gently wedge apart the hard plastic threads.

Use your hands to carefully remove the back casing so that none of the components fall out.