Right so,
JB Weld was useless, nothing more than glorified glue. Didnt really harden, was kinda like a blob of semi-hard paint and the moment i turned the ratchet it just twisted out.
I then got angry, so out came the dremel with a cutting disk. I rammed the dremel in the limited space, and began cutting away. got a decent gash in it before i ran out of space. Smashed the living crap out of it with a chisel and instead of aiming to turn it, i aimed to cut the head off, so went hard.
Began to get limited by space, again, so decided to change to a grinding stone on the dremel.... and went hard with that. More chiselling and by this point half the bolt was missing, and i could see the gap between the bolt and washer.
I decided to try and remove some more metal from it with pliers.... "did that just turn?"..... sure enough, with a mighty twist of the pliers it slightly turned again.
Spent the next 5 minutes turning it half a turn at a time, until it finally came out. GREAT SUCCESS.
Now that i have that out, nothing stands in the way of removing the unit and FINALLY beginning the rebuild. I still begin this Saturday morning.
The culprit.