Step 3 · Insert Toilet Shims

This is the step people usually slow down on. Go finger-tight first, then a quarter turn. No rush — replay the clip whenever it helps.

Take the plastic toilet shims and firmly push them into the gaps you identified. Slide the thin end in first. Add shims around the toilet base as needed until the toilet sits firmly on the floor and does not rock or wobble in any direction. Some shims are designed to be stackable if you have a larger gap. Push them in by hand; you should not need a tool. Be careful not to force them in so hard that you lift the toilet, as this can break the wax ring seal.