If it’s driven for a while with it slack I think the arm wears and you will keep tightening it until the arm touches the bottom of the box. Mine did anyway
Had td5 90 vague steering for a while could not find the issue till today.
The drop arm was loose on the box even though the lock tab was in its proper position.
Got the half inch snap on basher gun on it that took it up two full threads,took all...