Where can I get a replacement spring for the trigger pull weight? The lowest I can set this with current spring is 3.9 - 4.1 lbs. I dont want to remove this spring and modify it without having a back-up or two. If someone knows of a source for an aftermarket lighter weight spring, that would be even better. I'd like to adjust the trigger to about 2.5 lbs without having to change the whole trigger. Thanks for any info.