I don't think he wants to parallax a fixed front lens Phil. I'm sure he means that rotating the front objective is tight on an AO scope.
My Tasco 3-9x50 is mega tight as is my centre point scope. they do oosen off but if left for a while they tighten up again .it's the grease thy use i think.
Some fit a sea fishing rod coaster to the objective and that gives you a bit more leverage. https://www.pauls-angling-supplies.c...ck-p-1298.html
most fit them on the magnification adjuster but i have seen some that fit the pn the AO too . this one is fitted on the mag adjuster