I would be very slow to assume timingon any machine. Check the needle and threading direction.

Stitching!
 

Thanks to everyone for the suggestions and advice! I replaced the tension spring and both screws (which were very rough from many years of adjustment). Neither of my featherweights like newer wound thread spools and prefer the old stacked spools (no matter how situated). The replacements along with the old spools resulted in my being able to achieve good (if not great yet) stitching. Thank goodness patience is my strong suit!