have a new GX3, 532nm, 200mw laser that I purchased from Big Lasers in July. It was advertised as focusable, but I can not get the beam to do anything but diverge as I rotate the head outward. I have been work at this for 3 months, but no focal point/waist. I also bought the 2X beam expander from Dragon Lasers. I can not get a focal point using the beam expander either. Any suggestion???