When turning ON the shell thickness effect, should the Pinball radius be such that it is greater than the distance between the thickened faces of each the surface bodies in contact, or still the Pinball radius should be higher than the actual distance between the midplanes of the surface bodies in contact?nAnd if we turn the shell thickness effect OFF, then picking any of the thickened faces of the each surface bodies will have no effect on the contact and analysis, right?nWhat effect does the 'offset type' has?.