To replace the middle bit you need to do a bit of de soldering (For KO servo's at least). The position sensor is screwed to the middle bit of the case but you cant access the screws without de soldering the the three sensor legs to remove the PCB.
Just de solder the three large pads next to the input cable connections then the PCB will move out of the way.
I can post some pics of a stripped down servo if that would help.
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