Yes sir, that's what I was hoping for was that someone might have some good used original parts. The Dixie stuff is hit or miss from what I've read. Not sure who it's made by but I've read reviews that the mainsprings aren't reliable.Dixie Gun Works web site says they have a TP0701 mainspring for $15. The old catalog says it "requires fitting".
They also have a DP0742 Bridle that also might require some fitting.
Of course, there's always a chance that one of our members might have an old lock with parts they are willing to sell.
TN,Need a bridle and a mainspring for a Springfield lock. 1861-1890 should all be the same. Also possibly a good barrel for a Civil War era Springfield. 1861 or 1863 type.