Immovable Rod

This flat iron rod has a button on one end. You
can use an action to press the button, which
causes the rod to become magically fixed in place.
Until you or another creature uses an action to
push the button again, the rod doesn't move,
even if it is defying gravity. The rod can hold up
to 8,000 pounds of weight. More weight causes
the rod to deactivate and fall. A creature can use
an action to make a DC 30 Strength check,
moving the fixed rod up to 10 feet on a success.