Remove the white button bracket from the top of the machine head: using a small flat-bladed screwdriver to gently press in each of the two plastic clips holding it in place can help to safely loosen and lift it.

The white button bracket will remain attached to the machine by a small brown wire. Carefully rotate the white button bracket around and to the right so that you have clearance to continue disassembling the machine head.

Carefully lift off and set aside the small brass-colored spring that is now exposed on the front edge of the machine head.