On a properly fitted pin and hook there is no movement on "FIRING". Obviously you didn't read the post well. The hinge is "NOT" rotating (Moving) while under the load of firing.
On a well designed gun there is in fact very little pressure upon the Hinge while it is "Opening", unless of course it has one of those DUMB compensating springs in the forend to create friction upon both the hinge & the knuckle joint. Clean light oil has proven itself to work well. I would not prefer to open mine with "Dry" hinges.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra