If you have downloaded the tolerance test made by Angus Deveson at Maker's Muse, you may have found that the key is not very good for breaking the dials free. I've made an updated key that works much better. Make 2 of them and use one on each side.

If you haven't downloaded the tolerance test, you can do so here: https://gumroad.com/l/OxKwn

The video explaining it is here: https://www.youtube.com/watch?v=TYuLVN3YHw8