Originally Posted by
lhayes1976
One is more of a thunk thunk
I'd be concerned if mine sounded like that. All FWs I've had have all made the click noise, which I like. A thunk sounds like the feed dog might be set a bit high and hitting the needle plate. Only a guess, but one of my 15 clones made that noise and that's what was making it.
If you want to localise the sound, get a foot-ish length of clean rubber tubing, put one end in your ear and move the other end until the noise is loudest. Once you find the source I'm sure it wouldn't be hard to fix it.