Microsoft intellimouse optical Disassembly & cleaning
Its the tear-down and cleaning of the very compactly named: Microsoft IntelliMouse Optical 1.1A USB and PS/2 Compatible. the disassembly didn't go exactly as planned and had to fix some parts with superglue after the fact.
P/N: X800472 - 108 - PID 55250 - OEM - 2893402 - 0
I also later realized that I forgot to put the sensor lens in.... :(