Boiling water with a pastry cutter sat in the bottom to stop the glass candle jar from cracking.
Candle happily melting away sat on top of the pastry cutter. If you've got odd bits of candles you could melt them directly into the jam jar you are going to keep them in and then add the wick once you have taken the jar out of the water.
Once it had melted I put on the oven gloves and poured it into this old golden syrup tin (jam jars will work just as well). I had tied the wick to a spoon to stop it from falling into the wax while it cooled, and then laid the spoon across the top of the tin.