I don't look at the feed like that unless it gives me a reason to look so I don't have a clue. I have a friend that is really up in all of that or likes to check each machine she gets for it, yet I have sewn for too many years to count and if it doesn't give me any problems I don't check it out. This isn't a problem for lots of machines, but some times I suppose you would run into it where you would have to fix one.