" Years ago a lot of shops used to “arc” the new shoes to fit the drums…….now days most mechanics just look at you funny if you ask them about arcing the shoes, and wouldn’t recognize the equipment to do it if they tripped over it."

When I used to get new linings installed they were "fitted" to the drums by free hand sanding or grinding. I still do that on vintage motorcycles. Time consuming but a perfect fit is possible. A lot of desire for detail has been lost to technology.