Not a problem with the feed dogs but I haven't seen those on a 15 before. I'm assuming it is the age of the machine. I need to find one of the deeper spoked wheels. My fingers don't do the tight balance wheel. I have an industrial I don't like for that reason - I wish it had a big spoked wheel, too... I have had my finger pinched before... those industrial motors can be very powerful... between that and the needle end one has to be careful around those old ladies.