link doesn't work anymore but if this is the same part I had - it's missing in the image but I'm 99% sure it goes where the screw hole that doesn't have a screw is circled in the top right (pictured in the last step). not sure if this part is vital though

just for future reference, seeing as this is an old comment

I somehow ended up with a rogue torsion spring and I have no clue where it came from... I'm not sure if it would solve this, but after getting the carriage unstuck, my printer still refuses to work