For lurkers:

No need to bend the hammer spring, just lob off the right leg 1/4" from the hammer. Insert the trigger pin in so the groove is on the left and the hammer spring will hold it securely, exactly as it did when it had two legs.

I've been using this system for decades and the only reason I can determine why they make anti-walk pins is because people will buy them. As unnecessary as a full length recoil spring guide on a M1911 and they sell lots of those too!

-- Chuck