I recently recieved a Singer 6212C Singer Sewing machine. it is froze up and will not sew. The power works, can not turn wheel with hand it takes 2 to turn it. I have oiled it really well and have let it sit for awhile. Can anybody give me any suggestions how to get the hand wheel to turn. Or where I need to oil it. Or what oil to use to loosen it up. Thanks.