Will they charge me for a new hammer?
No charge to you on anything with it. They'll ship it out, convert it, send it back for free. I only have one that's not converted now. All mine are with the original parts in cosmoline in the boxes in bags and a plastic tub of they're 3 screw models. I use all those, so I don't want the extra risk and I get to carry one more round safely.
Another good thing for you since you're in 357, you don't have to worry about "Ruger only loads" like I do with 45 Colt.
