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Thank you! Let me know how it works for you!

I wonder how it would work with ebooks, putting transparent film with lines on an ipad.

You can also try adjusting the print on ebooks. Enlarging print has a similar to widening the margins.

I feel like that it works on my kindle. However, you than need to take a pen as pointer.
Often I also don't draw the lines I just draw them in my head.