i have recently accired a 503 j and my mother a 503A singer sewing machine....our problem is with both machines we cant get the tophat cams to do what it says it does....her machine came with the cams i bought mine separate,both the cam sets are the same,supposed to be for the 503 series plus alot more.....used her instructions to insert and try cams on both machines but there must be something we arent doing because none of the cams do the designs correctly.....any help out there????thank youso much,dezigns by danielle
