Hi, I just got my early 1970's Sears sewing machine out to use. I carefully oiled where the manual said to. I'm trying to thread a bobbin using the bobbin winder. I hear motor turning but the spool is not moving. The latch is in place, the clutch is released by pulling by pulling the hand wheel. Any suggestions to what might be wrong? I followed the manual and was especially careful with the oiling of the locations indicated. Maybe too much oil got on the point near the latch. Thx, Rose