Open up the top and use Tri-flow on the stitch selector stuff - then give it time out - I don't know what oil they used on those but they tend to stick. Turn it in every direction so the T-F can go in the little cracks and nooks. I had a different stuck machine under my bench for a time. I just oiled and turned it every once in a while - one day it decided to work - the only thing I did to it other than clean it up and re-do the tension... grime cleans off...