I have the kitchen aide pasta roller that attaches to the front of my mixer. I get black specks coming out from around the drive shaft. Also some specks are getting into the dough. Has anyone ever had this problem? I'm about to take it apart but I thought I would check this board for advise before doing so. There isn't any parts list that come with the attachment so I'm afraid if I do find something broken I might have to buy a whole new one.