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Hi Ken,
Why not adjust the low level drop so the screen stops 187mm higher than it does now.
Before you do that though get 2000mm x 375mm of black felt and tape it to the top of the screen in 4:3 mode. When you take the screen up 187mm you will have about 188mm of felt still hanging down to make up your top border. Screen centre will still be where it belongs. This way you don't spoil your screen with paint and can remove the felt whenever you want.
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