I have recycled pewter to make a footer for one of my pieces you can use a small pan on gas picnic stove. Old pewter has a lot of lead in it the modern bright has less , it’s best to melt in well ventilated area and allow 10% at least for shrinkage ensure mould is dry. If reusing pewter you need to scrape off flotsam skin before pouring and must pour in one
Hope this helps
Mel
