The 97B utilizes the same recoil and hammers springs as the 75B.
Both the 97B and 75B have 20 lb. factory hammer springs; you can purchase lighter hammers springs at Wolff Gunsprings
here.
Alternatively, if you do not mind modifying a factory part, you can progressively cut down the factory hammer spring until you achieve the desired results. Do keep in mind, however, that you run the risk of cutting off too many coils and making the spring too light to reliably ignite the primers.
By the way, welcome to CZForum!
DL