Dick this is a good place to talk about your #1. There are a lot of #1 owners that hang out here and will be happy to share your interest in all aspects of single shot rifles. What a classic ! Ruger #1 V in 220 Swift. I envy you. Thanks for posting here. Best of luck. POW
There are quite a few gunsmiths that work on Ruger triggers, but I'm not sure you will get the factory trigger down to 1.5 lbs. If you don't mind purchasing an aftermarket trigger, the Kepplinger seems to be ideal for the rifle you have. I have one on a No.1 S and it is incredible. Spendy, but you can get a good 2 lb break on it, then push it forward to the "set" position for a pull measured in ounces.