Last time I cleaned the lint out of my 301's feed dogs I didn't get the below "R" finger in the "O" slot correctly when replacing the needle plate. I remember the tension was bad and it did not improve regardless of bobbin case tension changes made or the disassembly and cleaning of the upper tension assembly. But, once I read the manual and saw that "R" was not in "O" and fixed that issue then all was fine.
Last edited by QuiltnNan; 03-13-2014 at 10:30 AM.
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