Hello

I have recently bought a delft clay casting set of rings which have a "Side hole" which is roughly the size of a 50p piece.

When I bought the rings, I was offered a set of rings with or without a side hole...when I asked the seller what advantage the side hole was for, she said it helped when casting flat objects like coins, which is exactly what I bought the delft set for.

However, I looked on YouTube for a video which showed a casting ring with a side hole but no videos are available.

So, can anyone explain ...or share a link...how I use the side hole to cast a coin please ?

Many thanks