Take her in for a service. My 2, 401A's sew like dreams. One was my mothers and when I inherited it, she'd never been serviced, but still sewed like a dream. She sewed all the time on clothing etc. I got the nicotine off, cleaned her up and sewed. However I did take her for a spa day to get really cleaned and timed etc. My guy said I could probably sew on her another 50 yrs without service, to just keep her oiled and clean out the lint. She was 57 yrs old (1956) when I got her in 2013.