Recently bought and received 2nd run ceramic plug for mag charger. My problem, as I'm sure it was somebody else's too, is once the switch assembly is out, pull the old plug out and install the new one and go to put the screws with the spin washers back on, they don't go in far enough to allow the switch assembly to "slide" back into the head assembly. Is there something I'm missing or is there another set of screws I need? I have been searching posts about installing the plug but no such luck.