Singer Heavy Duty 4423 only sewing one side of the button hole? I've double checked all settings, made sure the little lever is pushed back all the way, etc. I've tried going
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SINGER 4423 Heavy Duty Extra-High Sewing Speed Sewing Machine - Parent, grey, 15.5"W x 12"H x 6.25"D; 14.5 lbs. : Amazon.com.au: Home