OK,
Hard to explain but here goes...
Put the lid together (lid, hinge bar, spring, brackets, rollers and the two long rods).
Mount it as far as it will go down (half a hole visible).
Make sure the two rollers are as far up the lid as they will go.
Problem is that the two long rods are now resting on the top rear
rail of the plastic chassis rather than fit into the groove right in front of it and we will have to rearrange them.
Now comes the tricky part;
You need to place two fingers (I used index finger and the next) so
that they press the metal hinge bar backwards and another
finger (I used the thumb) on top of the lid, pressing down and forward
as if you were trying to "close" the lid and at the same time push it forward and downwards.
While doing this, press down on the whole lid assy to make the holes fit.
(Attached photo).
You need to do both sides at the same time.
Sounds hard and it is at first but with a little practice you can do it in 5 seconds.
Let me know if that helps.
Photo shows Beogram 2000 but the above also applies to Beogram 1800, 5000, RX and RX2 models.
Martin