Yeah, mine was totally fubared. I tried pulling on the thing & twisting just as you did, and nothing. The eye broke off when I resorted to trying to pry a little. Tapping from the inside didn't even help. I even tried whacking pretty good on it when I decided it was needing to be replaced, and nothing. Even when the center of it was drilled out it didn't want to let go of the metal; had to pry it out of there in pieces. The hole is good & clean now, so anybody coming after me will have no problem whatsoever, at least until it gets funked up again.
I'm ordering two sensors; I know if I don't the other side will be the same way. Also ordering a protection plate/dust shield for either side; mine was pretty crusty, and when I took a wire wheel to it to clean it up for a fresh coat of paint, it broke in two because of rust.
Funny you mentioned that sensor socket; it fell apart when I disconnected it, so it's on order too.
Just a few $$ for that.
I just decided to wait until everything is here before reassembling; my wife wasn't real pleased with the downtime, but she'll get over it.
I wish I could tear into the other side as long as it's down, but unfortunately I parked it in the garage with the right side close to the wall to give me more room on the left, so the right side will have to wait. I did crawl under it last night and got rid of the clutch delay valve. Spent way more time than I should've trying to get the line threaded back into the slave cylinder, but it's done. Can't wait to try it out!