Hot take: I was wrong about bracing my shelf against the drywall, a 12 pack proved it
Loaded 12 paint cans on the 6 foot garage shelf in Rochester and the whole thing sagged a half inch because I screwed straight into drywall with no stud. Pulled it down, hit two studs with 3 inch lag screws, and now it doesn't budge, so how are you guys finding studs behind old plaster without wrecking the wall?