yea removing that bolt was a pita for me. i tried days trying to get that one bolt off, it is a bolt that has thread on top and the rest is a pin. for some reason after i undid the thread it was stuck not coming out. i ended up using a chisel type flat screwdriver and hammered it away many times to take it off. i was about to give up but it was off.
one thing to take note of, there are 4 o rings thats in there. those need to be replaced as they seem to be old. i couldnt find a place that mentioned this. i am planning to find a similar o ring diameter to replace it.