I have an old Craftsman skill saw that was my dads since about 1970. Sears no longer manufactures blades for this saw and I have checked several other places to find blades but no luck. The model # for the saw itself is: 315-27722. The parts # on the blades is: 3-622320-00. Does anyone know where I can find blades and manual as well. I’m sure it needs some work in the housing like oil or grease. Thanks in advance.