Wow! Thank you sir! I don't know my ass from a hole in the ground when it comes to knots and construction, so thank you. This helped me out a lot. I am mixing some concrete for a small pad in my backyard, on a slight slope. I will be using a level line for the first time, and the information you are sharing is very helpful. Thank you.
I use that "cow hitch" or "engineer's knot," but the string I get is so slippery it keeps undoing itself. I wonder if there is a certain brand of string that works best?