The stock clutch fork ball is not adjustable but there are aftermarket adjustable ones, usually used with Lakewood type bell housings. I put one in my bellhousing, seems to me it had a sleeve that threaded into the housing and the ball stud screws into that and has a lock nut. Wouldn't you want to make it longer. not shorter, so the rod would have More effect? The stock clutch arm pivot ball is threaded into the bellhousing from the transmission side with an allen wrench and is non adjustable. Most of the adjustable ones are threaded in with a screwdriver slot But there may be one with a hex. The sleeve is threaded internal and external, the ball stud is threaded into the sleeve and held in place with a locknut.
If you have the adjustment rod all the way out and the clutch is not releasing something is out of wack. Maybe the wrong release bearing, there is a tall and short one. Or the wrong adjustment rod? Maybe it's not the clutch at all but the input shaft binding on the bearing in the end of the crank.I had to use offset bellhousing dowels to center my transmission in the register.