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i made it but i am confused with the size of paper, how do i know how big the size of J and L width should be? or any size should work? but lets say its too big then after finding the verticle line of those paper straight, how do i find my eye position to put the cue under? if the width is too...

can you please post a picture, thank you so much in advance

thank you very much for this post, much appreciated i have been having this vision problem for years now and cant fix it i am confused how to build this ! can you share a picture please!