Same problem here. I received my PRO for my Mk.1 yesterday and immediately put it on my extension. First thing I noticed was the wiggle: about a millimeter in X and Y. (at the grip height) It's particularly noticeable when I hold the extension steady in one hand, and move the grip in the other. I can feel the shifting of the grip with respect to the (completely solid) extension.
I followed the above instructions, removing the right half of the plastic shell and tightening the two screws on the metal adapter flange. They were
not extremely loose, I was only able to rotate them another 1/4-1/2 turn, as tight as I dared. I fear that having two screws at the top of this adapter is not enough to ensure the adapter does not move and/or eventually wear down the plastic around it.
I still get the same amount of wiggle in X, and slightly less in Y. Frankly, it is an unacceptable amount, and if tightening these screws does not fix it, I fear this is a design flaw. Can it be replicated on a device owned by VKB staff?
EDIT:I tried further tightening the two
exterior screws at the base of the grip to increase the force of the plastic against the metal adapter, and unfortunately they are now
shorn in half. With almost no effort, I reached the point of maximum tightness and continued past it without realizing it was happening. I'm not a ham-fisted guy... these screws are just way too soft. I was using three fingers on the screwdriver.
IT appears one of the screw holes is cracked. I don't know if that was my doing or not, probably so. I never felt any "breaking" sensation. The shafts of both screws are fully embedded in their brass receivers and with my tools, impossible to remove. If there is a Grip Fairy, I'm going to need their help.
EDIT AGAIN: (After posting the pictures)
I just tried to (gently) put the halves back together using the remaining screws, so as to avoid losing anything. I placed one of the screws in its hole, and gently started to rotate it. Something felt off, so I pulled away the screwdriver:
another screw head shorn from the shaft, this time with no effort at all! The shaft of the screw is barely a turn into the plastic. It hasn't even reached the other half of the grip yet. You can imagine my disbelief!
![Image](https://cdn.discordapp.com/attachments/320035068812853261/398716948843724800/20180104_235829.jpg)
![Image](https://cdn.discordapp.com/attachments/320035068812853261/398714385272406024/20180104_234621.jpg)
Note the crack:
![Image](https://cdn.discordapp.com/attachments/320035068812853261/398714385272406016/20180104_234633.jpg)