Setting cutout pressure on new Hubbell switch

I have an old Craftsman air compressor, but the cutout switch failed. I found a great deal on a Hubbell AC-0789 that is set from the factory with a cutout pressure of 175 psi, which I need to change to 125 psi. I read this was an adjustable switch, but I can't find a screw to turn to reset the high pressure side, nor can I find anything with a Google search. Can someone please help me out? Thank you.