Welcome to GBO!! ML McPherson tells of a method in the Handi section of his book, "Accurizing the Factory Rifle, with the hammer in the fire position, press forward on the hammer with about 20lbs force, pull the trigger, repeat several times. BUT....one person broke a piece in the trigger group doing that, so be aware of that possibility.
Trigger hone instructions are also in the FAQs.
I've also read of one person using the graphite method on RFC, but don't know anyone here that's tried it.
Tim