I have a Safety Hammerless 4th model that needs a new trigger return spring. I have all the parts disassembled ready to reassemble after I get this spring. I have looked on the Wolf springs website and they have the spring "assortment" kits for the top break "type revolvers namely Iver Johnson. I am confused as to which group of springs to purchase or more specifically what spring to use on this model. I love this little gun and I need to get it back in operation. Thank you for any help you can give.