M!ke, sorry for the picture, but the only adjustment is that turnbuckle at the very right end of this pic...The Grub screws are under the shifter box cover, accessed thru the rubber peep holes on the top of the shifter. If your grub screws are loose--well, you are very lucky..! Since that pin in the u-joint is as permanent as Mount Rushmore...
Interesting, 8ma1074 had a rubber boot as shown on Panteras right between the shift box and the U-joint, I'm guessing is original. Very early Geese didn't have the shift box.