Power and wheel flex

Hi everyone, i have had two apple watch that needed a complete rebuild, unfortunatley i keep damaging the power and wheel flex. its extremely delicate no matter if u manage to lift the motherboard it will always peel off...i tried to solder this back on but seem literally impossible... apple have added adhesive around and i cant see if they have soldered this part or do they just stick together? i have no issues soldering the microphone and vibrator as well as loudspeaker but the power flex is very annoying... also i am unable to find part for this? why is there no part for this particular flex repair, only the mic and loudspeaker is available to buy

any help would be much appreciated