First, we need to define words. The gun is a "Trade Brand Name" shotgun. A "Trade Brand name" shotgun is one that was made by a major gun maker (and before 1940) for and was sold by a wholesale sporting goods dealer, a retail chain store or an independent seller (your local hardware store) who chose the name to go on the gun. Please, when asking questions about one of these old guns enter the name just as it appears on the gun , no additions, no deletions. no contractions and no abbreviations. I have no listing for a shotgun with the name CENTRAL ARMS. I do have listings for just (1) plain CENTRAL, (2) CENTRAL ARMS CO and (3) CENTRAL ARMS CO ST. LOUIS NO 512. All are "Trade Brand Name" shotguns and were made by (in order) (1) J.Stevens Arms & Tool Company, (2) Crescent Fire Arms Company, J. Davenport Arms Co, J. Stevens Arms Co and (3) Crescent Fire Arms Co. W.H. Davenport Arms Company went out of business in 1910 and Crescent Fire Arms Company went out of business in 1930 or so, so there are no off the shelf parts available for these guns. (More about this in a moment.) Stevens Arms Company is still in business (I thinK) as part of Savage Arms Company. Can't tell from sure what make the gun in the photograph is but belive it may be either a Crescent or a Davenport. Several gun parts dealers have parts for these old guns from time to time. They buy old shotguns to break them up for parts and then sell the parts. You just have to try and hope to luck out. The dealers and their addresses are:
Gun Parts Inc. 226 Williams Lane, P.O. Box 299, West Hurley, NY 12491, Tel: 845 679 2417, Customer Service: 845 579 5867
Popperts Gun Parts, P.O.. Box 413, Glendale, PA 19030, Tel: 215 887 2391
Jack First Inc. 1201 Turbine Drive, Rapid City, SD 57701 Tel: 605 343 9544
Dixie Gun Works, Gun Powder Lane Box 130, Union City, TN 38281, Tel: 800 238 5785
You can also watch the various gun auction sites. They have gun parts and parts guns up for auction from time to time. Again you just have to keep checking.
You cannot repair a broken spring by welding. A broken spring must be replaced with a whole new spring. Springs are made and then heat treated to be able to bend and then spring back to their original shape. It's an art I never could master.