My mom's old Kenmore sewing machine skips stitches unless electrical tape is placed under the pressure foot like so. The feed dogs are okay and the machine is well oiled, what gives?

Paul's Sewing Machine Hobby

Stitch in Ditch Foot/Edge Joining Foot Sewing Machine

Understanding Feed Dogs (Raising & Lowering) on Kenmore 385 Series

sewing machine – Ink, Yarn & Beer

Understanding Feed Dogs (Raising & Lowering) on Kenmore 385

I noticed the stitches are slightly angled? Is this normal/a problem? : r/sewhelp

HEAVY DUTY METAL FRAME: Adds stability and provides long lasting durability SEWING MACHINE ACCESSORIES: A variety of accessories are included

SINGER Heavy Duty Sewing Machine With Included Accessory Kit, 110 Stitch Applications 4432, Perfect For Beginners, Gray

Restoration of a Vintage 1973 Kenmore Model 158.18032 Sewing

I noticed the stitches are slightly angled? Is this normal/a

HEAVY DUTY METAL FRAME: Adds stability and provides long lasting durability SEWING MACHINE ACCESSORIES: A variety of accessories are included

SINGER Heavy Duty Sewing Machine With Included Accessory Kit, 110 Stitch Applications 4432, Perfect For Beginners, Gray