It happened a few days after I read an article in Magnum on lubricating cases for rifle reloading.

I setup my press to load .303, and depriming the 3rd case gave me a squeak and a jammed press handle.

I forgot to lube the cases.

I was travelling the next few days, so I used my spare time to design a simple technique to remove stuck cases from dies, without injuring the decapping pin. I designed it to use generic hardware store items that were relatively cheap, so as not to end up spending more money than I had to to fix a stupid mistake.