Screwdriver
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- 10,157
Gave the glass a bit of a wipe,, now I can see two grooved lines in the glass.Looks the smaller screws are locking, when the two large screws are loosened the glass can be moved up and down in the frame.
I would expect the two larger screws to be the adjusters. The smaller screws probably hold the mechanism in place. I see (now) there are three adjusters. I can only guess one of the pair lifts the glass up, the other one pushes it down
If it were me, I'd have that thing apart to take a look. It does appear to be a particularly decent design.