Manual

Test 1         Test 2                        Test 3

8 newtons  7 newtons            7 newtons

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4 newtons      4 newtons        5 newtons

How I tested it

        First I took a springscale and attached it to the door and pulled up three times it was 7 newtons because it was two out of three 7 newtons was recorded twice and eight once.
Then I did the same thing only attached the springscale to the string it was 4 newtons.