It's a right-hand thread, meaning that if you turn is counter-clockwise
(from either end) it will come out.
If there is a portion of the hollow tube extended beyond the casting, you
could saw a slot to accommodate a screwdriver. If you have an "easy out"
that would be perfect for this job, unfortunately most people don't have
Soaking the part first with some penetrating oil and heating the aluminum
casting will help. Do this several times before trying to remove it. If one
end has damaged thread, you do not want to screw these damage thread through
the body, they will damage the internal threads in the aluminum casting.
Because of the hole through the bolt, this part is more fragile than in
appears. When you finally replace the adjuster, don't make the lock nut too