We recently purchased a Model 669 meat slicer. It has fatal flaws. The screws attaching the food carriage lack a slot to place a tool while removing the nuts. (for cleaning purposes) And... the screws attaching the food dellector & rear blade guide are sheet metal screws ... (Should be standard threads... they fasten into "White Metal" ... Zinc+Manganese?? I had to use a Dremel* tool to CUT the nuts off.