How do you guys typically handle these? Replacing a vanity in a 1950 home. No leaks with existing. Trap and waste arm are the older (heavier) thin-gauge, and need to be adjusted for depth. Tilework is tight so I can't see the wall connection. Do you cut and fernco, or open the wall and replace the arm? Client wants to keep it simple, but wondering how you draw the line on these jobs.