I need help in more ways than 1 but we'll only discuss sewing machine help here. For the 503, I need to find the cams. Having looked on EBay, are there "code words" to type in so that I search only for the cams or do I just persue and droool over all the available machines and hope there are also some bits & pieces & parts on the auction site? Truly don't have a clue and just wanting to find out this information. TIA ~ Chris