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Thanks, but I don’t think I understand the reasoning.
What is the intention of putting the string in front, and not above?
What’s the real intention?
How can I tell if the beam is straight by putting a string in front?
I’m not understanding, I’m sorry.
And is this method really effective for testing whether a board is straight, putting the string in front or above?
Because it only takes a little bit of sagging in the string (even a little) for it not to work.
I think it is difficult to stretch the string well so that there is no sagging, no?
Now I get it!