I own a pawnshop. this guy brings in a 29-2 that looks like he tried to do all these mods with out any experience. it looks as though he bobbed the hammer then decided he didn't like it and tried to solder it back together. Looks bad.
Ah... in that case, you need a .500" (1/2") Target hammer for an N frame. You can check the gunbroker.com auctions, ebay, and the classifieds here on this forum. You can post a want to buy ad there. I would guess it will cost between $30-$60 for one and like I said, 90% of the time in my experience they drop in and work fine.