On 8/29/2012 in reply to a Z axis stall err. E06-0313 Al who wrote to check for a worn hole in the plastic that the bit references from on the key board side. I am having bit depth problems when I change bits from carving to 90 degree vector bit. I tried again after reading said thread and during initial setup my carving bit doesn't touch anything when lowering on the keypad side. It lowers into the open space to the near side of the rail. There is no plastic that I can see. (In the thumbnail accompanying the thread it shows the bit touching down on the rail itself.) When the truck goes to the far side it always touches the bit plate ok. Am I missing a piece of plastic? There was mention of adding a dime to the area but in my case I don't know where I'd put it.