Yeah, I used to have a couple of these, leftovers from scrapped British cars with wire wheels. They’re awesome, for the reasons you mention. Problem is, they eventually get pretty funky, because the lead is so soft the ends become mushroomed. Ultimately, the head gets beat up so badly, it falls off the wooden handle. And that’s what happened to mine. You can buy new lead hammers from industrial suppliers, though they can be expensive. I found a lead-hammer mould in the Graham tools catalogue (grahamtool.com). It lets you melt down and recast your old lead-hammer head over and over again. They sell spare handles, too, so you can melt down and recycle all those old fishing sinkers, wheel weights and musket balls you’ve been hoarding for years.