An old customer called me because they had a walkway installed and it was only a few months old and it was falling apart. There are multiple problems that need fixing. I want to make the walkway all one level. Remove the step and follow the bottom angle to the top concrete pad. Once I remove the pavers I want to make the base one level. My question is how can I keep the angle without using a laser. Is a string line possible to achieve what I need to do?