Gillies Ball Sinker Mould (Size 1,2,3,4oz) Gillies range of sinker moulds represent excellent value for money by offering a multi sized array of sinkers per mould. A great way to save money and to recycle lead. TIPS : Melt lead in a heavy cast iron pot in a well ventilated area and make sure that the pouring ladle or spoon is dry. Pre-heat the sinker mould allows molten lead to flow. Protective clothing and a breathing mask such as a respirator is highly recommended.