I want one that is in good order please but the threads of the screws appear to be in good shape. What condition are the slots in the screw head like? Thanks!
The slots are JIS spec (dot on the head) not Philips and the damage most often occurs with the use of Philips Head screwdrivers. That's another problem I am working on. I've since bought a JIS No. 2 screwdriver.
I have a used Deore DX M560 Rear Derailleur with a Stroke Adjusting Screw that I haven't been able to unscrew any further because the head has become damaged due to the torque required to turn the screw. I am guessing that the screw and/or housing has some kind of corrosion that is making it difficult to turn.
I was lucky, I guess, that I was able to unscrew it enough to check the overall functionality on a bike with a 9-speed cassette.
I have managed to extract the Upper (small sprocket) screw but it was difficult too but I was able to fully grip the head...