Some time ago I made a serious error while pressure canning some potatoes, heating the canner too hot and blowing the safety fuse. Note how you can see daylight where the plug melted and gave way. So thankful it did! Could have drastically changed my kitchen layout if the canner had blown up.
The whole operation only took a few minutes, and I'm happy to report it was a complete success. I just finished canning up five quarts of chicken in my old canner with the new fuse and it's all good.