I have got the removal of these doors down to a fine art.
I use a small pick tool to lower the pin on one top guide and then hold it down with a thin blade while I release the other guide.
The door will then come out easily.
Some of my guides had virtually worn away so I spent many hours looking for replacements.
I found these:
They are the same size as the ones I replaced but they are not tapered like the ones on the GB, but the pin is solid nylon and can be easily shaped to fit the top track.
They work like a charm.
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