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Set the brick on the edge of the table then lay the line over the edge and tie it to a weight on the floor. Drag the line accross the brick, lifting the weight off the floor. When you lift the brick lift it to the same height for each line by making a mark on the table as far as how far you will move the line, If you do that 3 times for each line it will take the majority of the variations out since you will be lifting the same weight and draggin the same amount of line accross the brick.
Rough sketch but should explain,,,,,,
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