Got a new Airweight637 couple weeks ago, accurate, tight great little snubbie. But the trigger is hard to pull. I have a set of wolf trigger springs, 13, 14 & 15lb. and a 8lb hammer spring comming. I'm not so sure I want to replace the hammer spring , don't want light strikes and it's just fine. Any suggestion on weight of trigger spring so primer strike is not affected. Getting older so for carry I use federal 110gr low recoil HP. I have not taken off side plate yet to clean it. Any reply is appreciated. Thanks.