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SINGER MODEL 403A PLAYLIST:    • Regina, a SINGER SLANT-O-MATIC 403 SP...  
Tutorial for removing, repairing, and installing the Needle Thread Tension Unit and Tension Pin Releasing Lever on a Singer Model 403A Slant-o-Matic. A step-by-step how-to video with explanations of all the parts and how they work. How to Zero Out the tension unit. Do it yourself.
MUSIC: Follow The Shadows by the 126ers