First of all you have to understand that the chalk line is not the standard line that comes in the chalk line tool when you buy it from the store. Usually most timber framers replace this fuzzy fat line with something that will produce a very fine true line. The replacement product is a braided Dacron, most commonly sold as a fishing line, (at least I think that's where you can get it).
Using this thin true line it's easier to hold the framing square to the chalk line....
Jim Rogers
