Atwood Ladder End Caps
Several of our Atwood ladder step ends were cracked and the ladder rung could actually fail as a result. Its very dangerous to use a ladder with broken parts. Those creaks you hear when climbing need to be heeded.
You should examine all of the rungs looking for cracks, they tend to be at the center screw on the top face of the cap. It pays to periodically replace all step ends if any are cracked or have brittle ends.
We replaced all of them (they are not expensive, ~$6 per set, or $6 per rung) with new ones (VLPRBS-2). Now there is no more ghostly creaking when going up the ladder.