Four inches is a lot of lift. I doubt that there is that much "slack" in the white lift arms.
Why do you need to replace the wood bow? Is it rotted? Does the rear edge of the front shell still have the original arch? Does it match the arch of the front edge of the rear shell? Or has the roof sagged until the edge is straight or even sagged?
Do you need to raise the front shell only once, simply to be able to close the rear shell during the rework? Or are you looking to raise it 4" permanently?
I'm not quite getting the picture.
Bill
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