I have 2 vintage FW's and whenever I get a "new" machine I take it apart, clean all the dust & crap out of it and oil & lube with sewing machine oil & sewing machine grease. Usually in the manual it tells you only to grease in certain places (gears, small holes in motor) and never put oil on those places. I just got my 2nd FW the other day and when I opened it up, everything was dry looking and the machine ran sluggish. After cleaning and oiling, I put the machine back together and put the needle back in and the machine would not sew at all. It had no tension , it was skipping stitches 1 to 2 inches at a time ..I had put the needle in wrong. I had checked the manual to see what I could have done wrong....put needle in right and it runs like a charm. I do have another machine (newer one) that I think has a timing problem. It will not even pick up the bobbin thread. There are web sites where they show you how to fix stuff. Good luck