You can remove the mainspring and measure its length, diameter, and the thickness of the spring stock, then take thos dimensions to a good hardware store and buy one made with thinner wire, but you may run into trouble with misfires if you go too light.
I bought 10 springs (smallest purchase allowed) back before the recall, but the guns came back from Henry with lighter, crisper pulls than my DIY fix. Haven’t taken one apart since the recall, so I don’t know what other changes they made.
