clip to close dental prothesis plaster mould

At my Secondary and Professional Training School, in Dental Prosthesis laboratory a lot of clips were broken or lost, and it seems that it's not very easy to buy them separately from all the mould assembly.
The Teacher asked for me to redesign the clip from the last one (broken one) to get more.

We had to redesign the item by 3 times to get the perfect fix. They are happy with the new design, and they will be supplied directly from our Technology Dpt. whenever it would be necessary.