Are you sure M class bobbins can be wound on the Sidewinder Deluxe? I checked the description on JoAnn's and this is what it says:
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Compatability With Blue Bobbin Spindle: Brother 9.2mm Plastic, Pfaff Clear Plastic, Singer Class 15 Clear, Singer Class 15 Metal, Viking Green Plastic Bobbins; Red Bobbin Spindle: Baby Lock Clear, Berina 1630/180-200, Berina Metal, Berina CB All, Berina Clear, Berina Deco 330/340, Bernetta Class 15 Metal 50, 55, 56, 70, Brother 11.5mm Clear, Elna Metal, Elna Transparent, Gammil Bronze, Handi-Quilter, Janome Clear, Pfaff Metal, Riccar Clear, Singer Featherweight, Singer Transparent Class 15J, Singer Class 66 Plastic, Viking Groups 2, 3, 4 Transparent; Green Bobbin Spindle: Berina 830"