So for those of you who are a bit squeamish, look away now….because XDA forum member verkion has written up his experience on fixing his loose G2 hinge.
If you don’t want to use magnets in case the compass is affected, take a look at the XDA member’s teardown. verkion couldn’t find an online teardown showing the actual spring mechanism for the z-hinge and has helpfully provided a photo of the actual mechanism (pictured).
The fix actually proved quite simple – assuming you can get to the pictured point of disassembly, tightening up the mechanism apparently is super easy. Take the spring out, stretch it, and put it back in!
Head on over to the forum thread for more discussion._________