A little trick given to me from a jeweller in Melbourne. Mix the two part epoxy on a piece of paper with a toothpick then leave it in the glue after use. The glue has dried on your piece of jewellery when the toothpick cannot be removed from the paper. I know!!!!!!! Such a simple, logical idea and saves wiggling the piece and upsetting the connection. Now why didn't I think of that :(