When I looked up my cost on the replacement parts, it was under $15 for all of the screws, springs and the latch. My cost on the BCase is close to $50. Typically my cost is close to US retail - there are some notable exceptions but I don't think this is one of them because of what Rodney posted below. That said, if the new parts don't fit the old cases, it's a waste of money. If you give those same numbers to Glenn Williams in Florida, he can probably supply originals. The part numbers came from an original Singer parts chart.