Does anyone know of a place to get any information on an old electric berkel slicer. The id plate is so worn that you can't read the model number, just the s/n and info in motor. I have tried searching the net but without model can find nothing. I am guessing it is from the late 40's or 50's. It is black with stainless blade and meat tray. It runs great, would like to find how to disassemble and give a good cleaning, and how to use the built-in blade sharpener.