I finally managed to snag a second Ruger New Vaquero in gloss SS in 45 Colt as my main pair of pistols for CAS. Both are 4 5/8 bbls. my first one is serial no. 510-18XXX the second is 510-21XXX. 18XXX has a lighter trigger and is perfect, than than 21XXX. what is the easiest way to adjust the trigger pull weight on this revolver?