As stated - does anyone know the nut size for the Aux post on the 12V battery? I have seem posted 6mm x1 - this is not correct at least on my 4xe. I tried 8x1 and 8x1.25 as well as 10x1.25 and 5/16 and none fit that post. 8 mm seems the right size, but neither thread pitch I tried worked. Anyone know what size nut this is?