First of all, thanks to all of you for taking the time to reply!
I am still brand new to this forum so please bear with me. Can someone please tell me why I can no longer see the 3 photos I posted with my original post? I saw them right after I first posted and I see that some of you are referencing them. Can you say learning curve? ;-)
Now some feedback to your feedback.
To KeyKepper- I have seen those types on eBay and as you say, they are similar. However they are very different. I also have one of the types you posted and I know where you can buy them new. But they are like night and day. The ones you linked to are curved at the bottom and join together in the middle. My post hole digger is open in the middle/bottom. Thanks for looking them up!
To Mel Larson- Are the diggers you mention open in the center like mine? Mine is adjustable. If you look closely at the second photo you can see that if the shiny new bolt I put in is loosened you can move the metal grooved wedges that stick out the top to widen or narrow the width of the cutting blades (also called ears or lips).
To 1930- The inward facing “ears” or cutting blades are angled to screw into the soil. With nice moist dirt they screw down the sides of the “plug” of soil. When the top of the assembly compresses on the top of the plug, it just keeps the whole thing together. I just pull it straight up and I have a big 6-8 inch plug of soil. I tap it out and do it again. With dry, rocky soil it still can break it up, dig down deep and then I use a traditional two handle, clamshell digger to pull out the loose soil. The round bottom, joined in the middle styles that KeyKeeper was nice enough to post still don’t do as nice of a job.
To Branson- I’m curious about your use of the term “nose auger”. Is that what KeyKeeper posted the links to? Also, are you from Branson, MO? I graduated from Hollister in 1974!
To everyone else, thanks for your comments and observations!