I spent 2 hrs trying the exact same thing today. All I managed to do
was damage the cassette flap. The picture you show is the same as mine
i.e the release screw mentioned in the TIS has gone (fell out when I
tried to turn it recently). I even tried a couple of large screw
drivers to prise it out. When the screw was there it easy to take out!
Sorry to be useless but I needed to rant! Tried flat knives. Dynamite
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