Well....she asked "what rules""".....I don't use any! :lol: :lol: :lol:
Ok...so if you mean what rulers, then I use a mix of them all, but I prefer the Omni...start with the 6 x 24, then move to the 6 x 6 for squaring HST's and such. I square larger blocks with the 12 1/2 x 12 1/2. I put that stuff on the back of each one to keep them from sliding around and it works great!