I have revived worse that that. It would run just fine if it had some TLC. Some times it takes a couple hours. They usually need to have the tension cleaned and rebuilt. The bobbin case will need to be cleaned under the spring. Then it will need your normal dust bunny cleaning and some oiling. Those aren't usually very hard to remove the shuttle and clean all the lint out - about a 5 minute or less job. Some times I see a clone that will not turn. I love making them turn. Usually it takes awhile with some tri-flow. You need to oil every single part that remotely moves rotate the wheel as much as you can get it to turn as you oil. If it doesn't turn at all rotate the machine let it set for a while then oil it again. What is cool about making one turn is that they might start to turn a little but once the oil gets where the bad spot is you know it and the machine will suddenly turn and run like crazy.