Test 'Nails Through Plate' Strength

What happens here

The assembled wooden frame, constructed using the 'nails through plate' method, is carefully positioned over a Husky bottle jack. The operator then begins to pump the jack's handle, steadily applying upward pressure to the underside of the frame's top plate. As the pressure increases, the wood flexes under the strain. Eventually, the top plate completely detaches from the vertical studs, indicating the failure point. The creator notes that this frame failed at a '14' (presumably a unit of force or pressure reading from the jack or a gauge not explicitly shown).

Goal: Measure the failure point of the 'nails through plate' frame.