TIP: REPLACING JUST HAMMER and/or PAWL:
You do not need to pull the trigger, the PESKY GATE SPRING or transfer bar to remove the hammer and pawl. Once you take off the grip frame, the hammer pin is the only thing you have to remove to get them out. Just pull the hammer back and all the way down, then depress the hammer plunger in the base of the hammer with a small tipped screwdriver to clear the trigger extension where the transfer bar connects to it. Let the hammer & pawl fall out. Install in reverse! Piece o’ cake.
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MODIFYING BISLEY HAMMER FOR BIRDSHEAD OR STANDARD GRIP FRAME, Single Six, Vaquero or Blackhawk:
Before you trace your old hammer, make sure it fits flush with the grip frame ‘ears’.
Use the hammer pivot pin to hold the original and new hammers together and scribe both sides, then grind, file, sand and re-blue the portion you filed away (if blued).
I "hog out" most of the metal with an 1/8" x 1" Dremel course stone; hammer in a vise. Then true up the course grinding and the corner with a small double cut triangular file. Finish with 400 grit paper wrapped around a 1/4" x 1/2" alum sanding block with flat surfaces, and re-blue with Brownells OxPho blue. That will match the factory finish which is left a bit course. For a higher polish, follow up with 800 grit and 1000 grit. Polish with a Dremel flannel wheel using white rouge made for polishing stainless steel. Then blue.
Option: Notice that mine has part of the flare on the hammer spur removed as well to look more like a Super Blackhawk hammer.
http://www.rugerforum.com/phpBB/viewtopic.php?p=1543606#1543606
Stock Bisley hammer in rear, modified Bisley center and standard hammer in front (G2’s photo):
