We love this review, this is what we are here for. Thank you Mark!
"Finally I understand what this does!
For many years, I've struggled to understand just how my aga lid hinge mechanism worked. One side seemed to have a threaded hex grubscrew in, whilst the other side had a flat screw head in the same position which didn't seem to do much...as if the threads had stripped. It was a revelation once I'd read the description of my hinge mechanism on this website! My adjusting pin point had worn almost flat, so buying a replacement and stripping the whole thing down and re-assembling was a very easy job and once done, I used this new adjusting pin to align the top perfectly with the hot plate surround. Along with a new spring my lids are like new!"