My 3rd thumb ring

After I failed to make thumb rings, I tried it again.  This time, I only used dremel tool to shape it roughly.  After that, I only used files and sand papers to make it to fit in my thumb.  It took at least 6 hours.  The  result was, perfect.  I absolutely love it.

The pictures are the first version.  Now it's much thinner, shorter, and less bulkier than this, but the shape itself is the same.