Swear by dropping a golf ball down the flue on every quote, saved me two callbacks this spring
I picked this up from an old sweep in Dayton who never trusted a flashlight alone. That ball thumps different depending on whether you hit a ledge of creosote or a nest, and it tells me more in 5 seconds than 10 minutes of peering up with a mirror. Anyone else use a weighted ball, or am I the only one carrying a golf ball in my bucket?