Lead hammers are easy to make and don't damage your machined steel surfaces.
I have a small lead "knocker" but that one stays on the lathe. Time for a new hammer.
So I took two small pieces of pine (2x4 pieces actually) cleaned and squared them up.
Drilled 4 holes for long 1/4-20 bolts.
Drilled a hole for the shaft. (old piece from the junk box, cleaned and knurled.
The end of the shaft inside the lead head has a 3/16 screw through it to retain the lead head.
The round cylinder was cut using a round nose endmill and trepanning on the mill and then finishing the ends with a 1/4" em. Drilled two holes in one side for the lead in and air out. Melted the lead and presto, a nice new hammer.
The other one is for my mini mill and I used an old wrench, cut off one end (most of it) and made a similar mold that I seemed to have misplaced but it was made using the same principal and it was made of wood.