Although it doesnít last very long, I prefer to use a lead hammer when for example, scrolling material thatís twisted, to avoid marring it. A wooden mallet is too light and a hide mallet smokes and smells, and a brass or copper hammer is too dense. The hammers depicted will last a few sessions though and the mushrooms are easily removed, far easier than a copper insert. Hide inserts are fairly durable, but drop out, which is why I have these.
As you can see, I hope, I take a cheap holesaw blade, tighten up a hose clamp, in order to make a form in which to cast the lead. NB Donning leather jacket, leather apron, gauntlets and visor beforehand. Tuck feet beneath an open drawer in case a droplet penetrates jeans and disappears behind tongue of boot. Which has happened more than once.