Home Improvement Questions? Ask a Handyman for Answers
Have you tried adjusting the wheels of your machine? On many machines you can tilt the machine back on its hinges to see the underside and there you will find a thumbscrew to lower the feed dogs. Remove needleplate and clean out the built up lint between the teeth of the feeddogs. When moving from Feed Down to Up, rotate hand wheel one revolution to re-engage.
Have you tried oiling the armature?
The part the pulls the needle up and down?