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Yeah, the thing to remember is: lifting it out. Gravity is all that's holding it in its slot. Well... and friction.
If it doesn't lift easily--and as Martian says, you and a strong friend can't do it--try prising it up with some pry bars down in the track, under the thing edge of the door. Probably want one on both sides of the door. I've had to do that before.
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