then you have the heat treatment issue...hammers need to be anealled for bending and filing, aka fitting...and then there is hardening and drawing...all can be accomplished with a torch, distilled water and used motor oil...or if after fitting send erm off fur heat treating...or call dixon's gun shop in kempton, pa...they can do the whole job...perhaps including a pair of appropriate hammers...

keep it simple and keep it safe...