This is the last picture taken by my beloved Ricoh GR. Nothing special to see: iPad, tweezers, screwdrivers and a stick for sensor cleaning.  The iPad displays instructions how to get rid of a dust spot on a GR sensor (A guide to disassembling the Ricoh GR for sensor cleaning)

Last picture taken by my Ricoh GRbefore surgery Disassembling the camera body was not my preferred option to get rid of the dust spot. Vibration techniques using a noisy mixer proved to be useless (see my previous post).  Then I tried devices emitting smaller energy but at higher frequencies, such as sonic toolbrushes. Two Sonicare FlexCare+, each vibrating at a speed of 31'000 pulsations per minute were attached to the GR. On start, our cat left the apartment within two seconds but the dust spot wouldn't move a tenth of a millimetre. 
2 x 31'000 pulsations per minutePhilips Sonicare FlexCare+ plus

After these disappointments,  disassembling the camera to remove the dust spot manually seemed to be the only constructive option. The exercise went fine in the beginning. The main challenge was to keep record of the screws. Disassembling the Ricoh GRBack of the camera is removed

I got irritated by a loud pop when the screwdriver hit an electronic element on the print. No smell of  burned electronics, so I hoped all would be alright (Yes, I did remove the batteries before opening the camera).  GR dismantledRear screen lifted to the left. Sensor housing accessible for beeing unscrewed.

Only three screws left to be unscrewed and to free the sensor behind its housing.  The GR's 16 MP sensorwith dust spot on the right part

Removing the dust spot on the sensor was easy. Re-assembling went fine, too. Sadly, after inserting the battery and pressing the power button: nothing happens. 

Any tips how to reanimate the camera are highly appreciated.