Have a R4331 Planer that sounds like it is jammed. Kind of looks like it too. I changed the blades earlier today and in the process, two screws on the cutter head became stripped. I was able to extract one, the other is still embedded and won't budge. Not sure if this has anything to do with the problem. I don't know what could have jammed either. The cutter head turns to change the blades, yet the motor does not run. When I turn the unit on, the cutter head twitches, but nothing more. Uploaded video for your reference. Thank you in advance!