Pulling and Pushing a Plane by the Prop?

[Bill Greenwood]

As a safety matter, I would generally keep my hands and body away from the prop and out of its arc, despite the often shown photos of someone absently minded posing leaning on a prop, even veteran pilots who should know better.
I would not push on one blade, and if needed to push a two blade prop would do it at the hub only. Iwouldnt push on one blade or even two of a 3 blade or 4 blade prop.
Prop makers say not to push/pull on the blades, but it is often done without apparent harm. A person is not going to use as much force as the engine does when pulling the plane. Pushing on the tip of just one blade might cause damage.