I too am struggling as the OP now says in Post #13 of this thread that his sample, “is sharp at any distance.” But in that Torview points out the general consensus, “surely if this is just the scale moving/rocking under the clear window and the diopter gearing is disengaged so as to remain unaffected there is zero need for concern.” That would indicate, as so many others have pointed out, there has been zero need for concern all along, and the OP has possibly and unwittingly made a huge issue over nothing connected to actual diopter function or image.